Cheesy Shepherd’s Potato Casserole

This cheesy shepherd’s pie casserole layers ground beef, peas, and carrots in a thick tomato-and-Worcestershire gravy under mashed potatoes mixed with sour cream and sharp cheddar, with more cheddar melted on top. It bakes in a 9-inch square dish. Because the filling goes in hot and the potatoes go in warm, it only needs about 15 to 18 minutes in a 425°F oven to bubble at the edges and heat through. Plan on about an hour from start to serving, including a 10-minute rest so it holds its layers when you cut it. It serves 6.

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Shepherd’s Pie or Cottage Pie?

Strictly speaking, a pie made with beef is a cottage pie. In British usage, shepherd’s pie means lamb. In the United States, “shepherd’s pie” is the everyday name for the beef version, and that’s how this recipe uses it. This one is a cheesy American-style casserole, not a traditional British recipe. What sets it apart is the topping. Sour cream and cheddar are folded into the potatoes, so the top stays creamy underneath and browns in golden spots on the surface. For the lamb version, see the substitutions below.

Ingredient Notes

Exact quantities are in the recipe card. These are the ingredients worth a closer look.

• Lean ground beef: Use 90% lean. With the tablespoon of oil that softens the onion, there’s usually little fat to drain. With 80/20 beef, spoon off all but about a tablespoon of fat before adding the flour, or the gravy will turn greasy.
• Flour: One tablespoon turns the broth, tomato paste, and the water that cooks out of the frozen vegetables into a gravy that coats the beef. Without it, the filling tends to leak liquid under the potatoes and the bottom of the casserole comes out watery.
• Tomato paste and Worcestershire sauce: Two tablespoons of paste, cooked until it darkens slightly, adds savory depth without making the filling taste like tomato sauce. One tablespoon of Worcestershire adds tang and saltiness, so the filling needs only 1/2 teaspoon of kosher salt.
• Frozen peas and carrots: Add them straight from the freezer. They finish cooking in the gravy and in the oven, and they stay bright instead of turning gray.
• Mashed potatoes: Use 4 cups, homemade from about 2 1/2 pounds of russet or Yukon Gold potatoes, or store-bought. Three cups covers a 9-inch dish only thinly. Warm them before mixing so they spread easily over the filling. Store-bought mashed potatoes are often well salted, so taste them before adding anything.
• Sour cream, butter, and cheddar in the potatoes: A quarter cup of sour cream and 2 tablespoons of butter keep the potatoes creamy under the cheese. The half cup of cheddar mixed in seasons the topping and helps it hold its shape when you cut a serving. Shred the cheddar from a block. It melts more smoothly than bagged shreds.
• The baking dish: Use a 9-inch square ceramic, stoneware, or metal pan that’s labeled broiler-safe if you plan to broil. Glass bakeware such as Pyrex shouldn’t go under the broiler. Its manufacturer warns that direct broiler heat can make it break. In a glass dish, bake as directed and skip the broiler.

How to Make a Cheesy Shepherd’s Pie Casserole

1. Brown the beef and onion

Cook the beef and onion together in a little oil, breaking up the meat, until no pink remains and the onion is soft, about 6 to 8 minutes. Ground beef is safe at 160°F. If there’s more than about a tablespoon of fat in the pan, spoon it off now.

2. Thicken the filling into a gravy

Garlic and tomato paste go in first and cook until the paste turns a shade darker. Then the flour and spices go in, and after a minute, the Worcestershire, broth, and frozen vegetables. Simmer for 4 to 5 minutes. The filling is ready when the beef is coated in a glossy brown gravy and a spoon dragged through the skillet leaves a trail that fills in slowly. If it still looks loose, simmer another minute or two. If it’s too thick to spread, stir in a splash of broth.

3. Make the cheesy potato topping

Stir the warm potatoes with the butter, sour cream, and 1/2 cup of the cheddar just until combined. The topping should hold soft peaks on a spoon, not slump like a purée. Overmixing warm potatoes can make them gluey, so stop once the cheese is streaked through. If the potatoes are stiff, a tablespoon of milk loosens them.

4. Layer and seal the edges

Spread the hot filling evenly in the greased dish. Drop spoonfuls of potato around the edges first, then fill in the center and spread it out until the topping meets the sides of the dish all the way around. A sealed edge keeps the gravy from bubbling up over the potatoes. Drag a fork lightly across the surface to make ridges, which brown in the oven. Then scatter on the remaining cheddar.

5. Bake, brown, and rest

Bake until the gravy bubbles at the edges and the cheese has melted, 15 to 18 minutes. The center should read 165°F on an instant-read thermometer. For golden spots on the cheese, broil a broiler-safe dish 1 to 2 minutes, watching the whole time, because cheese goes from golden to burnt in seconds under the broiler. Let the casserole rest 10 minutes so the gravy thickens and the servings hold their layers.

Tips for Clean Layers

• Watery bottom: The filling went into the dish too loose. Next time, simmer it until the spoon trail holds, and don’t skip the flour.
• Greasy top or filling: Drain fatty beef well, and broil only until the cheese has a few golden spots.
• Dry potatoes: Stiff or cold potatoes dry out in a hot oven. Warm them first, and loosen them with a little milk if needed.
• Lukewarm center: The filling or potatoes went in cold. Bake a few minutes longer and check that the center reaches 165°F.

Substitutions

• Ground lamb: Use 1 pound of ground lamb in place of the beef for a true shepherd’s pie. Lamb is fattier, so drain it well. Cook it to 160°F.
• Ground turkey: Use 93% lean turkey with an extra splash of Worcestershire for depth, and cook it to 165°F.
• Vegetables: Frozen mixed vegetables with corn and green beans can replace the peas and carrots, cup for cup.
• Cheese: Colby Jack or a mild cheddar melt a bit more smoothly. Sharp cheddar has more flavor.

What to Serve with It

The casserole covers meat, vegetables, and potatoes, so a crisp green salad or simple steamed green beans are enough on the side. For another baked beef dinner, try our cornbread cowboy casserole. For a stovetop beef night, there’s taco spaghetti. You’ll find more in our dinner recipes.

Make Ahead

Assemble the casserole with cooled filling and potatoes, cover it, and refrigerate it for up to 1 day. Let it stand at room temperature for 20 minutes, then bake it covered with foil at 375°F for 25 minutes. Uncover and bake 15 to 20 minutes more, until the center reaches 165°F. Broil only a broiler-safe dish.

Storage, Reheating, and Freezing

• Refrigerate: Cool and refrigerate leftovers in a covered container within 2 hours. They keep for 3 to 4 days.
• Reheat: Reheat single portions in the microwave, covered, or the whole dish covered with foil in a 350°F oven, until the center reaches 165°F, about 20 to 30 minutes in the oven.
• Freeze: Freeze the baked and cooled casserole, or individual portions, tightly wrapped, for up to 3 months. The potatoes may be slightly softer after thawing. Thaw overnight in the refrigerator, then reheat as above.

Shepherd’s Pie Casserole FAQ

Can I use instant mashed potatoes?

Yes. Prepare enough for 4 cups following the package directions, making them a little thicker than usual, then mix in the butter, sour cream, and cheddar.

Can I make it in a 9×13-inch dish?

Double every ingredient for a 9×13-inch dish, and bake about 25 to 30 minutes, until the center reaches 165°F.

Why rest it before serving?

The gravy is still very loose straight out of the oven. Ten minutes lets it thicken, so each serving holds its layers instead of sliding apart.

Recipe Card