Can I use instant mashed potatoes for the topping?

Absolutely! No potato snobs here—instant works just fine. Just make them according to the package and spread on top.

What’s the best way to freeze this casserole?

Cool it completely, then portion into freezer-safe containers. Wrap well and label. To reheat, thaw overnight in the fridge or use the microwave defrost, then bake until hot.

Can I add veggies to the filling?

Totally! Toss in frozen peas, corn, or even carrots with the gravy and beef—just don’t go overboard or it’ll get too soupy.

How do I make it gluten-free?

Swap the all-purpose flour for a tablespoon of cornstarch, whisked into the beef broth before adding to the pan. It’ll thicken up just like classic gravy.

Salisbury Steak Casserole

Description

A ridiculously easy and cozy Salisbury Steak Casserole with juicy ground beef, mushrooms, savory gravy, and creamy mashed potatoes baked to golden perfection.

Ingredients

Scale

1½ pounds lean ground beef
Salt & black pepper, to taste
3 tablespoons unsalted butter (plus 2 more for topping)
½ cup diced onion (about half a medium onion)
8 ounces sliced mushrooms
2 teaspoons minced garlic (about 2 cloves)
2 tablespoons all-purpose flour
1½ cups beef broth
3 tablespoons Worcestershire sauce
1 tablespoon apple cider vinegar
4 cups mashed potatoes (store-bought or homemade)
2 tablespoons unsalted butter, cut into cubes (for topping)

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Instructions

Preheat your oven to 375°F (190°C). Grab a large, oven-safe skillet and set it over medium-high heat.
Brown the beef: Add ground beef, season with salt and pepper, and cook until mostly browned. Scoop the beef out and set aside (it’ll finish cooking in the oven).
Cook the veggies: In the same skillet, melt 3 tablespoons butter. Add diced onion and mushrooms; cook until tender (about 3–4 minutes).
Make the gravy: Add garlic and stir for a minute. Sprinkle in flour, stir to make a paste, then slowly whisk in the beef broth to make a smooth gravy. Let it simmer and thicken.
Combine and flavor: Return the cooked beef to the skillet. Stir in Worcestershire sauce and apple cider vinegar. Remove from heat.
Top and bake: Dollop the mashed potatoes over the beef mixture and spread evenly. Scatter cubed butter on top.
Bake: Pop the skillet in the oven and bake for 15–20 minutes, until the potatoes are golden and the casserole is bubbling.
Serve: Let it rest a few minutes, then dig in while it’s hot and cozy!

Notes

No oven-safe skillet? Transfer to a casserole dish before baking. Add frozen peas or carrots for extra veggie power. For a crispier top, broil at the end for a minute or two.

Prep Time: 10 minutes
Cook Time: 30 minutes
Category: Casserole
Method: Baked
Cuisine: American

Nutrition

Serving Size: 1 portion
Calories: 520
Sugar: 3g
Sodium: 850mg
Fat: 34g
Saturated Fat: 17g
Unsaturated Fat: 14g
Trans Fat: 1g
Carbohydrates: 22g
Fiber: 2g
Protein: 28g
Cholesterol: 95mg