Ingredients

2 pounds ground beef

10.5 ounces French onion soup, divided

½ medium onion, sliced

1 tablespoon unsalted butter

8 ounces mushrooms, sliced

10.5 ounces cream of mushroom soup

1 packet onion soup mix

¼ cup all-purpose flour

3 tablespoons ketchup

¼ cup water

2 tablespoons Worcestershire sauce

1.5 teaspoons ground mustard

1 teaspoon salt

½ teaspoon pepper

14.5 ounces French style green beans

3 cups prepared mashed potatoes

Instructions

Step 1: Preheat the oven to 350°F. Lightly spray a 9×13-inch baking pan with nonstick spray.

Step 2: In a large skillet, cook the ground beef with ⅓ of the French onion soup until the meat is no longer pink. Transfer the beef to a bowl and drain any excess fat.

Step 3: Add butter to the skillet. Sauté the sliced mushrooms and onions in the butter until the mushrooms are browned and the onions are tender.

Step 4: Spread the cooked ground beef evenly in the prepared baking pan.

Step 5: In a medium bowl, combine the remaining ⅔ of the French onion soup, onion soup mix, cream of mushroom soup, ketchup, water, Worcestershire sauce, flour, salt, pepper, and ground mustard. Stir well to combine.

Step 6: Pour the soup mixture over the ground beef in the pan and spread it into an even layer.

Step 7: Top the soup mixture with the sautéed mushrooms and onions.

Step 8: Drain and rinse the canned green beans thoroughly.

Step 9: Spread the green beans evenly over the mushrooms and onions layer.

Step 10: Top the casserole with the prepared mashed potatoes, spreading them into an even layer.

Step 11: Bake in the preheated oven for 25 to 30 minutes, or until the casserole is bubbly and the internal temperature reaches 165°F.

Step 12: Remove from oven and let the casserole set for 3 to 5 minutes; it may be slightly runny initially.

Step 13: Serve warm and enjoy your comforting Salisbury steak casserole.

Tips & Variations

For extra flavor, use fresh green beans instead of canned and blanch them before adding.

Try swapping ketchup with barbecue sauce for a smoky twist.

Use mashed sweet potatoes instead of regular potatoes for a slightly sweeter taste.

Adding a sprinkle of shredded cheddar cheese on top before baking creates a delicious bubbly crust.

FAQs

Can I make this casserole ahead of time?

Yes, you can assemble the casserole a few hours ahead and refrigerate it before baking. Just add a few extra minutes to the baking time if baking from cold.

Can I freeze Salisbury steak casserole?

This casserole freezes well. Cool completely, then freeze in an airtight container for up to 2 months. Thaw overnight in the refrigerator before reheating.