All the flavors of a classic burger baked into a cozy casserole—tender beef, mushrooms, Swiss cheese, and toasted buns in one comforting dish.

1 lb ground beef

1 tbsp olive oil

1 onion, chopped

8 oz mushrooms (cremini or white), sliced
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2 cloves garlic, minced

1 cup beef broth

1 cup sour cream

1 tbsp Worcestershire sauce

1 tbsp soy sauce

2 tsp Dijon mustard

Salt & pepper, to taste

4 hamburger buns, cubed

1 cup shredded Swiss cheese

Fresh parsley, chopped (optional garnish)

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Preheat oven to 350°F (175°C).

Heat olive oil in a skillet; sauté onions and mushrooms until softened, about 5–7 minutes. Add garlic and cook another minute.

Add ground beef; cook until browned, then drain excess fat.

Stir in Worcestershire sauce, soy sauce, Dijon mustard, and beef broth. Simmer for 5 minutes.

Remove from heat and whisk in sour cream until combined.

In a greased casserole dish, layer cubed buns and pour beef mixture evenly over them.

Top with shredded Swiss cheese.

Bake uncovered for 25–30 minutes, until bubbly and golden.

Sprinkle with parsley before serving, if desired.

Let the casserole sit a few minutes before serving so bread absorbs flavors.

Assemble in advance and refrigerate; add 5 more minutes to baking time when baking cold.