What to Do With Leftover Mashed Potatoes: 10 Easy Ideas

Wondering what to do with leftover mashed potatoes? Turn them into crispy potato pancakes, cheesy croquettes, homemade gnocchi, shepherd’s pie, or soft dinner rolls. Since the potatoes are already cooked, many of these recipes take less time than starting from scratch.

You can use leftover mashed potatoes for breakfast, quick snacks, hearty dinners, and even homemade bread. The best recipe depends on how much mash you have and whether it contains butter, milk, garlic, or cheese. Here are 15 ways to use leftover mashed potatoes, along with simple instructions, storage tips, and answers to common questions.

10 Quick Ideas for Leftover Mashed Potatoes

If you’re wondering what to do with leftover mashed potatoes, these 10 quick ideas will help you turn them into delicious breakfasts, easy snacks, and satisfying dinners.

1. Potato pancakes: Mix mashed potatoes with egg and flour, shape into patties, and pan-fry until golden.
2. Loaded potato bites: Combine the mash with cheddar, scallions, and seasoning, then bake or pan-fry.
3. Shepherd’s pie: Spread mashed potatoes over a cooked meat or vegetable filling and bake.
4. Mashed potato waffles: Add egg and flour, then cook in a greased waffle iron until crisp.
5. Potato croquettes: Shape the mash into cylinders, coat with breadcrumbs, and fry or bake.
6. Creamy potato soup: Stir mashed potatoes into vegetable soup or broth to thicken it.
7. Crispy breakfast hash: Fry the mash with onions, peppers, and leftover vegetables.
8. Homemade gnocchi: Combine mashed potatoes with flour and egg to make soft dumplings.
9. Potato casserole: Mix the mash with cheese and vegetables, then bake until hot and golden.
10. Soft potato rolls: Add mashed potatoes to bread dough for a tender texture.

These ideas work with many types of leftover mash. However, potatoes that are very wet may need additional flour for shaped recipes, while thick mash may benefit from a little milk or cream.

Easy Leftover Mashed Potato Recipes

1. Crispy Potato Pancakes

Potato pancakes are one of the easiest ways to use leftover mashed potatoes. They have a golden exterior and a soft center, making them suitable for breakfast, lunch, or a quick snack.

Prep time: 10 minutes
Cook time: 10–12 minutes
Servings: 2–3

Ingredients

• 2 cups cold mashed potatoes
• 1 large egg
• 3 tablespoons all-purpose flour
• 2 tablespoons chopped green onions or chives
• 2 tablespoons grated cheddar cheese (optional)
• Salt and black pepper, as needed
• 2 tablespoons oil or butter for frying

Instructions

1. Place the mashed potatoes in a bowl and add the egg, flour, green onions, and cheese.
2. Mix gently until the ingredients hold together. If the mixture is too wet, add another tablespoon of flour.
3. Shape the mixture into small, flat patties.
4. Heat the oil or butter in a skillet over medium heat.
5. Fry the patties for 3–4 minutes on each side until golden brown and heated through.
6. Transfer to a plate lined with paper towels and serve hot.

Tip: Serve with sour cream, plain yogurt, or a fried egg. If your mashed potatoes are already salty or heavily seasoned, taste the mixture before adding more salt.

2. Mashed Potato Waffles

A waffle iron can turn leftover mashed potatoes into crisp, savory waffles. They are a useful alternative to hash browns and pair well with eggs or roasted vegetables.

Prep time: 5 minutes
Cook time: 10–15 minutes
Servings: 2

Ingredients

• 2 cups mashed potatoes
• 1 large egg
• ¼ cup all-purpose flour
• ¼ cup shredded cheese (optional)
• Black pepper, to taste
• Oil or cooking spray

Instructions

1. Mix the mashed potatoes, egg, flour, cheese, and black pepper in a bowl.
2. Preheat and lightly grease your waffle iron.
3. Spoon the mixture onto the hot iron, spreading it slightly without overfilling.
4. Close the lid and cook until the waffles are crisp and golden. Cooking time will depend on your waffle iron.
5. Carefully remove the waffles and repeat with the remaining mixture.

Tip: Avoid opening the waffle iron too early. The waffles need enough time to form a crust so they hold together when removed.

3. Breakfast Potato Hash

If you have leftover vegetables, cooked meat, or onions in the refrigerator, combine them with mashed potatoes for a filling breakfast.

Prep time: 10 minutes
Cook time: 12–15 minutes
Servings: 2

Ingredients

• 2 cups mashed potatoes
• ½ onion, diced
• ½ bell pepper, diced
• ½ cup cooked vegetables or diced cooked ham
• 1 tablespoon oil
• Black pepper, to taste
• 2 eggs (optional)

Instructions

1. Heat the oil in a wide skillet over medium heat.
2. Add the onion and bell pepper and cook until softened.
3. Stir in the cooked vegetables or ham.
4. Add the mashed potatoes and spread the mixture across the pan.
5. Let it cook undisturbed for several minutes so the bottom becomes golden.
6. Turn sections of the mixture and cook until the potatoes are hot and lightly crisped.
7. Serve with fried or poached eggs, if desired.

Tip: A wide skillet gives the potatoes more contact with the pan, helping them brown instead of steam.

4. Cheesy Mashed Potato Muffins

These savory muffins are easy to portion and make a convenient breakfast or snack. You can add vegetables, cooked bacon, or herbs to change the flavor.

Prep time: 10 minutes
Cook time: 20–25 minutes
Servings: 6–8 muffins

Ingredients

• 2 cups mashed potatoes
• 1 large egg
• ½ cup shredded cheddar cheese
• 3 tablespoons all-purpose flour
• 2 tablespoons chopped green onions
• Black pepper, to taste

Instructions

1. Preheat the oven to 400°F (200°C).
2. Combine the mashed potatoes, egg, cheese, flour, green onions, and black pepper.
3. Grease a muffin tin and divide the mixture among the cups.
4. Bake for 20–25 minutes, until the tops are lightly browned and the centers are set.
5. Let the muffins cool slightly before removing them from the tin.

Tip: If your mash contains plenty of milk or cream, add a little extra flour if needed to help the muffins hold their shape.

What to Do With Leftover Mashed Potatoes for Dinner

5. Shepherd’s Pie or Cottage Pie

Shepherd’s pie is a hearty way to turn leftover mashed potatoes into a complete dinner. Traditionally, shepherd’s pie uses lamb, while cottage pie uses beef. You can also prepare a meat-free version with lentils or mushrooms.

Prep time: 20 minutes
Cook time: 25–30 minutes
Servings: 4

Ingredients

• 3 cups leftover mashed potatoes
• 1 pound ground lamb or beef
• 1 small onion, diced
• 1 carrot, diced
• ½ cup peas
• 1 tablespoon tomato paste
• ½ cup beef or vegetable broth
• 1 teaspoon Worcestershire sauce (optional)
• 1 tablespoon cooking oil
• Black pepper, to taste

Instructions

1. Preheat the oven to 400°F (200°C).
2. Heat the oil in a skillet and cook the onion and carrot until softened.
3. Add the ground meat and cook until browned.
4. Stir in the tomato paste, broth, Worcestershire sauce, peas, and black pepper.
5. Simmer until the filling thickens, then transfer it to an oven-safe baking dish.
6. Spread the mashed potatoes evenly over the filling.
7. Use a fork to create ridges on the surface so the top browns nicely.
8. Bake for 25–30 minutes, or until the filling is bubbling and the potatoes are golden.

Tip: For a vegetarian version, replace the meat with cooked lentils, mushrooms, or a mixture of vegetables. Make sure the filling is thick before adding the potato topping.

6. Cheesy Mashed Potato Casserole

A potato casserole is a simple option when you have a large amount of leftover mash. Cheese, cooked vegetables, and herbs add flavor without requiring a complicated recipe.

Prep time: 10 minutes
Cook time: 25–30 minutes
Servings: 4

Ingredients

• 4 cups mashed potatoes
• 1 cup shredded cheddar cheese
• ½ cup cooked broccoli or sautéed mushrooms
• ¼ cup milk, if needed
• 2 tablespoons chopped green onions
• Black pepper, to taste
• 1 tablespoon butter for greasing the dish

Instructions

1. Preheat the oven to 375°F (190°C).
2. Grease a baking dish with butter.
3. Combine the mashed potatoes, half the cheese, vegetables, green onions, and black pepper.
4. Add a little milk if the mixture is too stiff to spread.
5. Transfer the mixture to the dish and sprinkle the remaining cheese over the top.
6. Bake for 25–30 minutes, until hot throughout and golden on top.

Tip: Add cooked chicken, turkey, or ham if you want a more substantial meal. Avoid adding too much liquid, as the casserole should hold its shape when served.

7. Homemade Gnocchi

Gnocchi are soft Italian dumplings that can be served with butter, herbs, pesto, or tomato sauce. Leftover mashed potatoes can make the process easier, although the amount of flour required depends on how wet the mash is.

Prep time: 20 minutes
Cook time: 5–10 minutes per batch
Servings: 3–4

Ingredients

• 2 cups cold mashed potatoes
• 1 large egg yolk
• ¾ cup all-purpose flour, plus more as needed
• ¼ teaspoon salt, or to taste
• Extra flour for dusting

Instructions

1. Place the mashed potatoes in a large bowl and mix in the egg yolk.
2. Add the flour gradually, along with the salt.
3. Mix gently until a soft dough forms. Add more flour a tablespoon at a time if the dough is too sticky to shape.
4. Transfer the dough to a lightly floured surface and divide it into portions.
5. Roll each portion into a rope about ½ inch thick and cut it into small pieces.
6. Bring a pot of salted water to a gentle boil.
7. Cook the gnocchi in batches. Remove them with a slotted spoon when they float and are cooked through.
8. Toss with warm butter and sage, pesto, or your favorite sauce.

Tip: Do not knead the dough excessively. Too much flour or overworking can make the gnocchi dense. Mash containing large amounts of milk, butter, or cheese may need adjustments.

8. Mashed Potato Pizza Crust

If you want to experiment with leftover potatoes, try a potato-based pizza crust. It will be softer than a conventional bread crust, so a binder is important.

Prep time: 10 minutes
Cook time: 25–35 minutes
Servings: 2–3

Ingredients

• 2 cups mashed potatoes
• 1 large egg
• ½ cup shredded mozzarella
• 2–4 tablespoons all-purpose flour, as needed
• ¼ cup pizza sauce
• ½ cup shredded mozzarella for topping
• Your preferred pizza toppings

Instructions

1. Preheat the oven to 425°F (220°C).
2. Mix the mashed potatoes, egg, cheese, and enough flour to make a mixture that can be spread without running.
3. Line a baking tray with parchment paper and spread the mixture into a thin round or rectangle.
4. Bake for 15–20 minutes, until the base is set and beginning to brown.
5. Add a thin layer of pizza sauce, mozzarella, and toppings.
6. Return the pizza to the oven for another 8–12 minutes, until the cheese melts and the toppings are hot.

Tip: Keep the toppings light and avoid adding watery vegetables without cooking or draining them first. The crust will remain more delicate than traditional pizza dough.

9. Creamy Potato Soup

Leftover mashed potatoes can thicken soup without requiring a separate roux. This is particularly useful when you want a warm meal with minimal preparation.

Prep time: 5 minutes
Cook time: 15 minutes
Servings: 3–4

Ingredients

• 1½ cups mashed potatoes
• 3 cups vegetable or chicken broth
• ½ onion, finely chopped
• 1 tablespoon butter
• ½ cup milk, optional
• Black pepper, to taste
• Chopped parsley or chives for garnish

Instructions

1. Melt the butter in a saucepan over medium heat.
2. Add the onion and cook until softened.
3. Pour in the broth and bring it to a gentle simmer.
4. Add the mashed potatoes a few spoonfuls at a time, whisking to incorporate them.
5. Simmer for 5–8 minutes, stirring occasionally.
6. Add milk if you prefer a creamier consistency.
7. Season with black pepper and garnish with parsley or chives.

Tip: If your mash already contains milk, cream, or cheese, adjust the additional dairy accordingly. Add the potatoes gradually to prevent lumps.

Snacks and Appetizers Made With Leftover Mashed Potatoes

10. Mashed Potato Croquettes

Croquettes turn leftover mashed potatoes into crisp, bite-sized snacks. Their breadcrumb coating creates a crunchy exterior while the center remains soft.

Prep time: 20 minutes, plus 30 minutes chilling
Cook time: 15–20 minutes
Servings: 10–12 croquettes

Ingredients

• 2 cups cold mashed potatoes
• 1 egg yolk
• ½ cup shredded cheese
• 2 tablespoons chopped parsley
• ½ cup all-purpose flour, for coating
• 1 egg, beaten
• 1 cup breadcrumbs
• Oil for frying

Instructions

1. Mix the mashed potatoes with the egg yolk, cheese, and parsley.
2. Shape the mixture into small cylinders or balls.
3. Refrigerate for 30 minutes to help them firm up.
4. Prepare three bowls containing flour, beaten egg, and breadcrumbs.
5. Coat each croquette in flour, dip it in egg, and roll it in breadcrumbs.
6. Heat oil in a deep skillet to approximately 350°F (175°C).
7. Fry the croquettes in small batches until golden and heated through.
8. Drain on a wire rack and serve hot.

Tip: You can bake the croquettes at 425°F (220°C) for about 20–25 minutes, turning halfway and lightly spraying them with oil. The texture may be less uniform than deep-fried croquettes.

How to Store Leftover Mashed Potatoes Safely

Before choosing a recipe, make sure your leftover potatoes have been stored properly. Refrigerate cooked mashed potatoes within two hours of cooking, or within one hour when the surrounding temperature is above 90°F (32°C). Transfer them to shallow, airtight containers so they cool more quickly.

Use refrigerated mashed potatoes within three to four days. If you are unsure how long they have been stored or whether they were left out too long, discard them.Do not rely on smell or appearance alone to determine whether leftovers are safe.

Tips for Making Better Leftover Mashed Potato Recipes

• Fix dry potatoes. Stir in warm milk, broth, or a little butter gradually until the potatoes reach the consistency you need.
• Handle gummy potatoes carefully. Overworked potatoes can become sticky because of the starch. The texture may not return to normal, so use them in casseroles, soup, or other dishes where smoothness is less important.
• Adjust the seasoning. Leftover mash may already contain salt, garlic, herbs, or cheese. Taste it before adding more seasoning.
• Add flour gradually. Recipes such as gnocchi, potato pancakes, and croquettes need enough flour to hold together, but too much can make them heavy.
• Use a suitable cooking method. Pan-frying works well for patties and bites, baking suits casseroles and duchess potatoes, and gentle stovetop heating is ideal for soup.
• Avoid wasting small portions. Even half a cup of leftover mashed potatoes can thicken soup, fill a sandwich, or become a small batch of potato cakes.

Final Thoughts

If you are wondering what to do with leftover mashed potatoes, there are plenty of ways to turn them into something new. Make crispy pancakes for breakfast, prepare shepherd’s pie for dinner, fry croquettes for a snack, or use plain mash to make soft dinner rolls.

For the quickest results, choose potato pancakes, waffles, or cheesy potato bites. If you have a larger batch, a casserole or shepherd’s pie can turn it into a complete meal.

Whatever recipe you choose, store your mashed potatoes safely, use refrigerated leftovers within three to four days, and reheat them to 165°F (74°C). With a little planning, yesterday’s side dish can become tomorrow’s meal.

Frequently Asked Questions (FAQs)

Q1. What is the best way to use leftover mashed potatoes?

Potato pancakes are one of the easiest options. Mix leftover mashed potatoes with an egg and a little flour, shape into patties, and pan-fry until golden and crispy.

Q2. Can you freeze leftover mashed potatoes?

Yes. Store mashed potatoes in airtight, freezer-safe containers or bags. For the best quality, use them within one to two months and thaw them in the refrigerator before reheating.

Q3. How long are leftover mashed potatoes good for?

Leftover mashed potatoes generally last three to four days in the refrigerator when stored promptly in airtight containers at 40°F (4°C) or below.

Q4. Can you make potato cakes with leftover mashed potatoes?

Yes. Combine two cups of mashed potatoes with one egg, three tablespoons of flour, and your preferred seasonings. Shape into patties and fry in a lightly oiled skillet until both sides are golden.

Q5. How do you reheat leftover mashed potatoes without drying them out?

Reheat mashed potatoes in a saucepan over low heat with a splash of milk or broth and a little butter. Stir regularly until they reach an internal temperature of 165°F (74°C).