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Delicious Leftover Mashed Potato Recipes

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Transform leftover mashed potatoes into crispy potato cakes or creamy casseroles with simple ingredients and minimal fuss. Perfect for quick, comforting meals that feel fresh and satisfying.

Ingredients

  • Leftover mashed potatoes (well-chilled and firm)
  • Eggs (large, room temperature)
  • Cheese (cheddar, Parmesan, or mozzarella; sharp cheddar preferred)
  • Unsalted butter (softened)
  • All-purpose flour (or almond flour for gluten-free option)
  • Milk or cream (whole milk or half-and-half)
  • Fresh herbs (chives, parsley, or thyme)
  • Onions or shallots (finely chopped and sautéed)
  • Salt
  • Black pepper
  • Smoked paprika
  • Garlic powder
  • Sour cream or Greek yogurt (optional)
  • Olive oil or cooking spray
  • Optional add-ins: cooked bacon pieces, sautéed mushrooms, roasted bell peppers, spinach, jalapeños, cayenne pepper, roasted garlic

Instructions

  1. Remove leftover mashed potatoes from the fridge and let sit at room temperature for about 10 minutes. Add a splash of milk or cream if too dry and stir gently.
  2. Optional: Heat a teaspoon of butter or oil in a skillet over medium heat. Add finely chopped onions or shallots and cook until translucent, about 3–4 minutes. Let cool slightly.
  3. In a large bowl, combine mashed potatoes, eggs (start with one and add more if needed), cheese, sautéed onions, herbs, and seasonings. Stir until well combined but avoid overmixing.
  4. Sprinkle in 2–3 tablespoons (30–45 grams) of flour to help bind the mixture. Adjust as needed—the batter should be firm but not dry.
  5. Form the mixture into small patties about 3 inches (7.5 cm) wide and 1/2 inch (1.25 cm) thick. Place on a plate or tray lined with parchment paper.
  6. Heat a non-stick or cast iron skillet over medium heat and add a tablespoon of oil or butter. Let it get hot but not smoking.
  7. Carefully place the potato cakes in the pan, leaving space between each. Cook for about 4–5 minutes per side, or until golden brown and crispy. Flip gently to avoid breaking.
  8. Remove the cakes and place on paper towels to drain excess oil. Serve warm with sour cream, chives, or your favorite dipping sauce.
  9. For casserole style: Preheat oven to 375°F (190°C). Spread leftover mashed potatoes into a greased 9×13 inch baking dish, dot with butter, sprinkle cheese and herbs on top. Bake for 25–30 minutes until bubbly and golden.

Notes

Let mashed potatoes come to room temperature before mixing for easier shaping. Use eggs and flour to bind the mixture. Cook on medium heat to avoid burning or sogginess. Chill patties before cooking for extra crispness. Avoid overcrowding the pan. Experiment with herbs and spices for flavor variations. Flash freeze patties before freezing to maintain texture.

Nutrition

Keywords: leftover mashed potatoes, potato cakes, mashed potato casserole, crispy potato cakes, easy leftover recipes, comfort food, quick dinner, mashed potato pancakes

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