Introduction

This Mushroom and Swiss Burger Casserole combines hearty ground beef with savory mushrooms and melted Swiss cheese for a comforting, easy-to-make meal. Perfect for busy weeknights, it delivers classic burger flavors in a warm, satisfying dish.

The image shows a white baking dish filled with a creamy, baked mushroom casserole. The top layer is golden-brown melted cheese with some bubbly, slightly browned spots. Underneath the cheese, there are browned mushroom slices scattered throughout a smooth, creamy white sauce. The casserole is garnished with small green parsley leaves sprinkled evenly across the top. The baking dish sits on a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 lb Ground Beef (can be swapped for ground turkey, chicken, or plant-based meat)
1 Onion (yellow onion or shallots work well as substitutes)
8 oz Mushrooms (crimini or button mushrooms can be used interchangeably)
3 cloves Garlic (use fresh garlic for best results)
1 cup Beef Broth (chicken broth can be used for a lighter flavor)
1 tbsp Worcestershire Sauce (essential for a savory kick)
2 tbsp Soy Sauce (adjust quantity for lower sodium versions)
1 tbsp Dijon Mustard (complements the rich flavors)
6 oz Swiss Cheese (cheddar, mozzarella, or any melty cheese can be used as alternatives)
1 cup Sour Cream (Greek yogurt can be used as a healthier option)
4 pieces Hamburger Buns (gluten-free buns can be used for a gluten-free version)
2 tbsp Olive Oil (adds richness to the dish)
to taste Salt (essential for seasoning)
to taste Pepper (essential for seasoning)
1 tbsp Fresh Parsley (optional garnish for freshness and color)

Instructions

Step 1: Preheat your oven to 350°F (175°C) to ensure it’s hot and ready for baking.
Step 2: Heat olive oil in a large skillet over medium heat. Add the ground beef and break it up with a spatula. Cook until browned and cooked through, about 5-7 minutes. Season with salt and pepper, then remove from the skillet and set aside.
Step 3: In the same skillet, cook the chopped onions and mushrooms until softened, about 5-7 minutes. Add the minced garlic and sauté for another minute until fragrant.
Step 4: Return the cooked beef to the skillet. Stir in Worcestershire sauce, soy sauce, Dijon mustard, and beef broth. Let the mixture simmer for 5 minutes to blend the flavors.
Step 5: Remove the skillet from heat and stir in the sour cream until well combined.
Step 6: Cube the hamburger buns and spread them evenly on the bottom of a casserole dish. Pour the beef and mushroom mixture evenly over the buns.
Step 7: Top with shredded Swiss cheese and bake in the preheated oven for 25-30 minutes, until the cheese is melted and golden brown.
Step 8: Garnish with fresh parsley before serving for a pop of color and freshness.

Tips & Variations

For a lighter version, swap ground beef for ground turkey and use Greek yogurt instead of sour cream.
Try different cheeses like cheddar or mozzarella for a flavor twist.
Use gluten-free buns to make the casserole suitable for gluten-sensitive eaters.
Adjust soy sauce quantity to control the saltiness to your taste.

Storage

Store leftover casserole in an airtight container in the refrigerator for up to 3 days. Reheat in the oven at 350°F (175°C) until warmed through, or microwave individual portions. This dish does not freeze well due to the bread base becoming soggy.

How to Serve

A close-up view of a white square dish filled with a baked cheesy mushroom casserole, showing two main layers: the bottom layer is a creamy mixture with small dark brown mushrooms, textured and thick, while the top layer is a golden-brown melted cheese with both smooth and bubbly spots, sprinkled with small green parsley leaves for color contrast. The dish is placed on a white marbled surface, with soft natural lighting highlighting the shiny and gooey melted cheese texture. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I make this casserole ahead of time?

Yes, you can prepare the beef mixture and assemble the casserole a day in advance. Keep it covered in the refrigerator and bake just before serving.

What can I use if I don’t have Worcestershire sauce?

You can substitute Worcestershire sauce with soy sauce mixed with a little lemon juice or vinegar for acidity to maintain the savory depth.