Salisbury Steak Casserole is a comforting, layered one-dish meal featuring seasoned ground beef in a savory mushroom-onion gravy, topped with green beans and creamy mashed potatoes. Ready in about 35 minutes (only 10 minutes prep), it serves nine and turns classic Salisbury steak flavors into an easy casserole—ideal for busy weeknights, potlucks, or feeding a hungry family without making individual patties and sides.
This dish hits nostalgic notes for many of us who grew up with classic comfort foods. Instead of frying separate patties, this casserole layers browned ground beef with a rich mushroom gravy, sautéed onions and mushrooms, canned green beans, and a blanket of mashed potatoes for an all-in-one meal that’s both simple and satisfying.
What makes the recipe practical is how it streamlines work while preserving flavor. Brown the meat, sauté the vegetables, whisk together a quick gravy, assemble the layers in a 9×13 dish, top with mashed potatoes, then bake. No shaping patties, no separate side dishes—just hearty comfort in a single pan.
If you want more family-friendly casseroles, try other comfort recipes that use similar pantry ingredients and minimal effort.
See the recipe card below for exact ingredient amounts and full instructions.
Ingredient Notes
- Ground beef – Use lean ground beef for best results, or substitute ground turkey if you prefer a lighter option.
- Soup mix – A dry onion soup mix works well; you can also use a brown gravy or au jus packet.
- Mashed potatoes – Leftover mashed potatoes work great, or use store-bought or freshly made potatoes.
- Mushroom soup – Condensed cream of mushroom makes the gravy rich; cream of onion or cream of potato can be used in a pinch.
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How To Make Salisbury Steak Casserole
- Preheat oven to 350°F. In a large skillet over medium heat, melt butter and sauté mushrooms and sliced onions until the mushrooms brown and the onions are soft. Remove and set aside.
- Cook the ground beef with one-third of the French onion soup until no pink remains. Drain excess fat and return the meat to the bowl.
- Whisk together the remaining French onion soup, onion soup mix, cream of mushroom soup, water, Worcestershire sauce, ketchup, flour, ground mustard, salt, and pepper to make a smooth sauce.
- Spray a 9×13-inch baking dish. Spread the cooked ground beef evenly in the bottom, pour the sauce over it, then sprinkle the sautéed mushrooms and onions on top.
- Drain and rinse the canned green beans, then spread them evenly over the mushrooms and onions.
- Top with prepared mashed potatoes in an even layer. Bake at 350°F for 25–30 minutes until bubbly and the mashed potatoes begin to brown. Let the casserole rest 3–5 minutes before serving.
Refer to the full recipe card below for exact measurements and detailed steps.
Storage
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat single servings in the microwave in 30-second intervals until warm. For larger portions, reheat covered in a 350°F oven until heated through.
How To Freeze
Cool the casserole completely, then wrap tightly or transfer to a freezer-safe container. Freeze for up to 3 months. Thaw overnight in the refrigerator before reheating. Freezing single portions makes quick lunches or dinners easy to pull from the freezer.
Serving Suggestions
This casserole is a complete meal, but you can serve it with a simple green salad, roasted vegetables, extra buttery noodles, or crusty bread to soak up the gravy and stretch the meal for more guests.
Easy Ground Beef Recipes
- Beefaroni – Kid-friendly pasta in a tomato-based sauce.
- Baked Spaghetti Casserole – Cheesy, layered comfort food.
- Stuffed Bell Pepper Soup – All the flavors of stuffed peppers in a comforting soup.
- Skillet Beef and Shells – A quick one-pot pasta and beef meal.
Frequently Asked Questions
Salisbury steak is a comfort-food classic: seasoned ground beef formed into patties (or, in this casserole, a ground beef base) served with a brown onion gravy. It’s often paired with mashed potatoes and green beans.
Only in that both use ground beef. Salisbury steak is more like an open-faced hamburger served with gravy, while meatloaf is a baked loaf made with binders and seasonings.
The dish is named after Dr. James H. Salisbury, a 19th-century physician who promoted a meat-centric diet. The name stuck to this hearty, meat-forward preparation.
Recipe Tips & Tricks
- Get a golden top – Broil for the last few minutes for extra browning, watching closely to avoid burning.
- Easy cleanup – Spray the casserole dish with cooking oil before assembling.
- Adjust consistency – Add 1–2 tablespoons of beef broth if the meat mixture seems dry.
- Let it rest – Allow the casserole to sit a few minutes after baking so the sauce thickens and it slices more cleanly.
- Boost flavor – Add a pinch of your favorite steak seasoning or extra Worcestershire sauce for deeper savory notes.
Salisbury steak casserole delivers classic comfort in every bite: budget-friendly ground beef, tender vegetables, rich gravy, and fluffy mashed potatoes all in one dish.
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Salisbury Steak Casserole
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Ingredients
- 2 pounds ground beef
- 10.5 ounces french onion soup
- ½ medium onion sliced
- 1 tablespoon butter unsalted
- 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 mashed potatoes prepared
Instructions
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Preheat oven to 350°F and spray a 9×13 pan with nonstick spray.
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In a large skillet, cook ground beef with ⅓ can of French onion soup until no pink remains; remove and drain excess fat.
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In the same skillet, add butter and sauté mushrooms and onions until tender and browned.
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Spread the cooked ground beef into the prepared pan.
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Combine the remaining ⅔ can of French onion soup, onion soup mix, condensed mushroom soup, ketchup, water, Worcestershire sauce, flour, salt, pepper, and mustard; stir until smooth.
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Pour the soup mixture over the ground beef and spread evenly.
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Top with the sautéed mushrooms and onions.
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Drain and rinse canned green beans and spread them over the mushrooms and onions.
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Top with prepared mashed potatoes in an even layer.
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Bake at 350°F for 25–30 minutes or until bubbly and the internal temperature reaches 165°F.
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Remove from the oven and let rest 3–5 minutes before serving.
Notes
- Get a golden top – Broil briefly for extra browning, watching carefully.
- Easy cleanup – Spray the casserole dish before assembling.
- Adjust consistency – Add a tablespoon or two of beef broth if the meat mixture is too thick.
- Let it rest – Allow a few minutes after baking so the casserole sets.
- Spice it up – Add your favorite steak seasoning to the meat mixture for extra flavor.
Nutrition
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