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Leftover Mashed Potato Shepherd's Pie
Irish

Leftover Mashed Potato Shepherd's Pie

A weeknight shepherd's pie that puts cold leftover mashed potatoes to work as the topping, over a beefy filling of ground beef, frozen veg, and a quick savory gravy. On the table in 45 minutes with one skillet and a hot oven.

45 minsEasy4 servings575 kcal

This is the recipe for the bowl of mashed potatoes sitting in your fridge after a roast dinner, too good to throw away but not exciting to reheat. Instead of warming them up as a side, they become the topping for a proper weeknight pie: a savory ground-beef filling with frozen veg and a quick pan gravy, baked until the top is golden.

It works because cold mashed potatoes are firm enough to spread over the hot filling without melting into it. The filling is deliberately simple: flour plus beef broth makes a gravy in the same skillet, frozen vegetables mean no chopping beyond one onion, and dragging a fork across the top creates the ridges that turn crisp and brown in the oven.

Expect a golden, slightly crisp potato crust over a thick, savory filling that eats like a full meal. It serves four generously and reheats well the next day, so it's worth making even for two.

shopping_basketIngredients

  • 1 lb ground beef80/20 or 85/15; or leftover cooked ground beef
  • 1 tbsp vegetable oilonly if needed to brown the beef
  • 1 yellow oniondiced
  • 2 cloves garlicminced
  • 2 tbsp tomato paste
  • 2 tsp Worcestershire sauceoptional, but it deepens the flavor
  • 2 tbsp all-purpose flour
  • 1 cup beef brothlow-sodium if you have it
  • 1 1/2 cups frozen mixed vegetablespeas, carrots, and corn; no need to thaw
  • 3 cups leftover mashed potatoescold, straight from the fridge
  • 1 tbsp buttermelted, for dotting on top
  • 1/2 tsp salt and 1/2 tsp black pepperplus more to taste

Nutrition Per Serving

Calories

575

Protein

27g

Fat

32g

Carbs

41g

restaurantInstructions

1

Brown the beef

Heat the oil in a large oven-safe skillet over medium-high heat until it shimmers. Add the ground beef and break it into small crumbles with a wooden spoon. Cook 5 to 6 minutes, stirring occasionally, until no pink remains and a thermometer reads 160°F (71°C). Drain off any pooled fat so the filling stays thick rather than greasy.

2

Build the filling

Lower the heat to medium. Add the onion and cook 3 to 4 minutes until soft and translucent. Stir in the garlic, tomato paste, and Worcestershire sauce and cook 1 minute more, until the tomato paste darkens slightly. Sprinkle over the flour and stir to coat everything.

3

Make the gravy and add the veg

Pour in the beef broth, scraping up the browned bits from the bottom of the pan. Bring to a simmer and cook 5 to 6 minutes, stirring, until the sauce thickens enough to coat the back of a spoon. Stir in the frozen vegetables and cook 2 to 3 minutes until heated through. Season with the salt and pepper.

4

Top with the potatoes

Spoon the cold mashed potatoes over the filling and spread gently to the edges with the back of a spoon. Drag a fork across the top in ridges; those peaks brown and crisp in the oven. Drizzle the melted butter over the top.

5

Bake and rest

Bake in a 400°F (200°C) oven for 15 to 18 minutes, until the filling bubbles at the edges and the potato peaks are golden brown. If the top needs more color, switch to the broiler for the last 2 to 3 minutes and watch it closely. Rest 5 to 10 minutes before serving so the gravy sets.

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Cooking Mode

Keep your screen awake with step-by-step guidance.

lightbulbTips for success

  • Use the mashed potatoes cold, straight from the fridge. Warm mash is too soft to spread and melts into the filling instead of sitting on top as a distinct crust.
  • Roughen the potato top with fork tines before baking. The ridges catch the heat and brown, giving you the contrast between crisp peaks and creamy potato underneath.
  • Drain the beef fat after browning. Leftover fat pools under the potato layer and makes the filling greasy, and the topping slides around when you serve it.
  • Rest the pie 5 to 10 minutes before scooping. The gravy thickens as it cools slightly, so portions hold their shape instead of running.

swap_horizSubstitutions

  • No beef broth? Use water plus an extra teaspoon of Worcestershire sauce, or a crumbled beef bouillon cube dissolved in 1 cup of water.
  • No ground beef? Ground turkey or ground pork work; turkey is leaner, so add an extra tablespoon of oil when browning.
  • No Worcestershire? Leave it out, or use a splash of soy sauce for a similar savory depth.
  • Gluten-free: replace the flour with 1 tablespoon cornstarch stirred into the cold broth before adding it to the pan.

restaurantWhat to serve with it

This is a full meal on its own, but a simple green salad with a sharp vinaigrette cuts the richness. Hot sauce or brown mustard on the side is good for anyone who wants more bite.

kitchenStorage & reheating

Keeps 3 to 4 days in an airtight container in the fridge; refrigerate within 2 hours of baking. To freeze, cool completely, wrap the dish tightly or portion into containers, and freeze for up to 3 months for best quality.

To reheat: Reheat portions in a 350°F (175°C) oven for 15 to 20 minutes until steaming and the center reaches 165°F (74°C). The microwave works in 2 to 3 minutes per portion but softens the potato crust.

Recipe FAQ

Can I assemble shepherd's pie ahead of time?expand_more

Yes. Assemble it in the baking dish up to 24 hours ahead, cover, and refrigerate. Add about 10 minutes to the bake time since it goes into the oven cold.

Why is my shepherd's pie filling watery?expand_more

The gravy didn't cook down enough. Let the filling simmer until the sauce visibly thickens and coats the back of a spoon before adding the potato topping. Draining the beef fat well also helps.

Can I use instant mashed potatoes for the topping?expand_more

Yes, if you make them on the thick side and chill them first. Soft, freshly whipped mash spreads too thin and sinks into the filling.

Is shepherd's pie the same as cottage pie?expand_more

Technically, shepherd's pie is made with lamb and cottage pie with beef. In the US, 'shepherd's pie' has become the standard name for the beef version too, so this recipe follows that common usage.

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