Weeknight Shepherd’s Pie with Leftover Roast Beef

This Weeknight Shepherd’s Pie transforms leftover roast beef into a hearty casserole. The beef is simmered with onions, mushrooms, peas, and carrots in a savory gravy, then topped with fluffy mashed potatoes and baked to golden perfection. It’s an easy, comforting way to give your Sunday roast a second life!

8 servings

Prep Time 30

Cook Time 20

Total Time 50

Ingredients

Mashed Potato Topping:

3 medium (639 g) potatoes, peeled
½ cup (114 g) milk
2 tablespoons butter
½ teaspoon salt
¼ teaspoon white pepper

Meat Layer:

1 tablespoon vegetable oil
¼ cup (13 g) onion, chopped - (fresh or frozen)
4 ounces (113 g) fresh mushrooms, sliced or chopped - or 2 oz. canned mushrooms, sliced
1 cup (140 g) frozen peas and carrots
1 .87 oz package (24 g) brown gravy mix + 1 cup water - (or use leftover gravy)
1 package (482 g) beef roast au jus-17 ounces - (or 2-3 cups leftover beef roast, fork-shredded or cut into chunks)
¼ teaspoon dried thyme
freshly-ground pepper
paprika
2 tablespoon (28 g) butter - thin slices

Instructions

Preheat Oven to 350˚ F (180˚C).

Make the Mashed Potato Topping: Peel and chop 3 medium potatoes, peeled.
Cover with water, and boil until tender. Drain well. Mash potatoes until smooth.
In a microwave-safe bowl, heat 1/2 cup milk and 2 tablespoons butter in the microwave for 1 minute. Add to the potatoes. Season to taste with 1/2 teaspoon salt and 1/4 teaspoon white pepper
Prepare the Vegetables: Preheat a large skillet. Add 1 tablespoon vegetable oil.
Sauté 1/4 cup onion, chopped in skillet until soft.
Add 4 ounces fresh mushrooms, sliced or chopped to onions, and continue to sauté until browned.
Add 1 cup frozen peas and carrots.
Cook the Gravy: In a small bowl, whisk together 1 .87 oz package brown gravy mix + 1 cup water.
Add the gravy mixture to the skillet along with 1 package beef roast au jus-17 ounces and 1/4 teaspoon dried thyme. Stir and simmer until the mixture begins to thicken. Season with freshly-ground pepper.
Put It All Together: Lightly grease a 1-1/2 quart casserole dish.
Pour the beef mixture into the dish and spread evenly.
Carefully spoon mashed potatoes on top and swirl with a spatula.
Sprinkle with paprika (optional) if desired and dot with 2 tablespoon butter, thinly sliced.
Bake in 350˚F (180˚C) oven for 20-25 minutes or until potatoes are golden on top and the beef mixture is bubbly.

Notes

Gravy: Skip the brown gravy mix if you have enough leftover gravy. You can also make your own using this homemade beef gravy recipe.

Nutritional Information