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5 from 3 votes

Leftovers Cottage Pie Recipe

Turn last night’s leftovers into a classic cottage pie in 30 minutes. It’s the ultimate comfort food this winter.
Course Main Course
Cuisine American
Keyword Cottage Pie
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 4
Author Ali Randall


  • 3 cups cooked leftover beef brisket or roast, shredded and chopped
  • 3 cups mashed potatoes, leftover or store-bought
  • 1 cup frozen vegetables
  • 1 tablespoon olive oil
  • 1/2 onion, chopped
  • 1 cup mushrooms, chopped
  • 2 tablespoons butter
  • 2 tablespoons flour
  • 1 cup beef broth
  • 1/2 cup shredded cheddar cheese


  • Preheat the oven to 400°F. Slowly reheat or microwave the mashed potatoes until smooth and creamy. In a medium sauce pan, add the olive oil and sauté the onions and mushrooms for 3 to 5 minutes until softened.
  • Add the butter and stir until melted. Sprinkle in the flour and mix until browned. Slowly add the beef broth and stir until the gravy has thickened and is smooth. Add in the frozen vegetables and chopped leftover beef brisket and stir until well combined and just heated through
  • Pour the mixture into a 9-inch square baking dish and smooth the mashed potatoes on top. Sprinkle with shredded cheddar cheese and bake for 20 minutes, until the cheese has melted and the potatoes are browned slightly.