Six ingredients, one pan, and about 90 minutes in the oven — most of which you spend doing something else. Ground beef and onion browned and seasoned, layered with thinly sliced potatoes and a cream of mushroom sauce, topped with shredded cheddar and baked until the cheese is golden and the potatoes are completely tender. It’s the kind of casserole that’s been appearing at family dinner tables for decades and hasn’t needed improving.
The one thing that determines whether this works or doesn’t: how thin you slice the potatoes. Thin — ⅛ inch — and they cook through in the covered bake time. Thick, and the center stays firm and underdone while the rest of the casserole is ready. A mandoline is the fastest route there. A sharp knife and patience gets you to the same place.
Prep: 20 minutes · Bake: 75 minutes · Serves 6 · One pan
6 Ingredients
- 1½ lbs (680g) ground beef
- 1 medium onion, chopped
- 2 lbs (900g) potatoes, peeled and thinly sliced — russets or Yukon Golds, ⅛-inch rounds
- 1 can (10.5 oz) cream of mushroom soup
- 1 cup (240ml) whole milk
- 1½ cups (150g) shredded cheddar — or a cheddar blend
- Salt, black pepper, and seasoning — garlic powder and paprika work well
How to Make It
Step 1: Brown the Beef
In a large skillet over medium-high heat, cook the ground beef and chopped onion together, breaking the meat apart as it goes, until fully browned — about 7 to 8 minutes. Drain the fat. Season well with salt, pepper, and whatever seasoning you like. Garlic powder, onion powder, and a pinch of smoked paprika all fit here. Remove from heat.
Step 2: Mix the Sauce
Whisk together the cream of mushroom soup and milk in a bowl until smooth. Season lightly with salt and pepper. This mixture is what keeps the potato layers from drying out during the hour in the oven and binds everything together.
Step 3: Layer and Bake
Preheat the oven to 375°F (190°C). Grease a 9×13-inch baking dish.
Layer as follows: half the potato slices on the bottom, slightly overlapping, seasoned with salt and pepper — then half the beef mixture spread over the potatoes — then half the soup mixture poured over the beef. Repeat: remaining potatoes, remaining beef, remaining soup. Press the whole thing down gently to compact the layers.
Cover tightly with foil and bake for 55 to 60 minutes. The foil traps steam and cooks the potatoes through. Test with a knife at the 55-minute mark — it should slide through every layer without resistance. If there’s any firmness, cover and return for another 10 minutes.
Remove the foil, scatter the shredded cheese over the top, and return to the oven uncovered for 15 minutes until the cheese is melted and golden in patches.
Rest for 10 minutes before serving. Straight from the oven the layers slide apart when you scoop. Ten minutes of resting lets everything firm up into proper portions.
What Goes Wrong
Underdone potatoes. Usually sliced too thick, or the foil wasn’t sealed tightly enough to trap steam. Aim for ⅛-inch slices and seal the foil well.
Watery casserole. Beef fat wasn’t drained before layering. Drain thoroughly.
Dry top layer. Soup mixture didn’t reach the top potatoes. Make sure the final pour of soup covers the surface before the foil goes on.
Make This When You Need to Feed People Without Thinking Too Hard
The whole prep takes about 20 minutes — brown the beef, mix the soup, slice the potatoes, layer the dish. Then the oven does everything else for an hour and fifteen minutes. The result is the kind of casserole that empties completely at the table without anyone being able to say exactly why it’s so good. It just is.
Tell me in the comments what seasoning you added to the beef and whether you went with russets or Yukons. Rate the recipe, save it on Pinterest, and subscribe for more.
Print
Grandma’s Beef and Potato Bake
A layered casserole of thinly sliced potatoes and seasoned ground beef bound together with a cream of mushroom soup and milk sauce, topped with shredded cheese and baked until golden and bubbling. Classic American comfort food — one pan, six ingredients, feeds a crowd.
- Total Time1 hour 35 minutes
- Yield6 servings 1x
Ingredients
The Casserole
- 680 g ground beef (1 1/2 lbs)
- 1 medium onion, chopped
- 900 g potatoes, peeled and thinly sliced into 1/8-inch rounds (2 lbs)
- 1 can cream of mushroom soup (10.5 oz)
- 240 ml whole milk (1 cup)
- 150 g shredded cheese (1 1/2 cups) — cheddar or a cheddar blend
- salt, black pepper, and seasoning of your choice (garlic powder, paprika, onion powder)
Instructions
Brown the Beef
- Cook the beef and onion: In a large skillet over medium-high heat, brown the ground beef with the chopped onion, breaking the meat apart as it cooks, until no pink remains — about 7–8 minutes. Drain the excess fat. Season generously with salt, pepper, and any additional seasoning you like (garlic powder and paprika work well here). Remove from heat.
Make the Sauce
- Mix the soup and milk: In a bowl or jug, whisk together the cream of mushroom soup and milk until smooth and combined. Season with a little salt and pepper. This is the sauce that binds the layers and keeps the potatoes from drying out during the long bake.
Layer and Bake
- Layer the casserole: Preheat the oven to 375°F (190°C). Grease a 9×13-inch baking dish. Arrange half the sliced potatoes in an even layer on the bottom, overlapping slightly. Season with salt and pepper. Spoon half the beef mixture over the potatoes. Pour half the soup mixture over the beef. Repeat the layers — remaining potatoes, remaining beef, remaining soup. Press down gently to compact the layers.
- Bake covered first: Cover tightly with aluminum foil and bake at 375°F for 55–60 minutes, until the potatoes are fully tender when pierced with a knife. The foil traps steam and ensures the potatoes cook through without drying out.
- Add cheese and finish: Remove the foil. Scatter the shredded cheese evenly over the top. Return to the oven, uncovered, for 15 more minutes until the cheese is melted and bubbling with golden patches. Let the casserole rest for 10 minutes before serving — this helps the layers hold together when scooped.
Notes
Thin, even potato slices are essential — ⅛-inch is the target. Thick slices won’t cook through fully in the covered baking time and leave you with an undercooked center. A mandoline makes this easy; a sharp knife and patience works too. Russet potatoes give the starchiest, most binding result; Yukon Golds are creamier and hold their shape slightly better. Don’t skip the foil for the first 55–60 minutes — uncovered, the top dries out and the potatoes don’t steam through properly. The casserole is done when a knife slides through the potato layers without resistance.
- Prep Time: 20 minutes
- Cook Time: 1 hour 15 minutes
- Category: Dinner, Main Course
- Cuisine: American
Nutrition
- Calories: 520
- Sugar: 4
- Sodium: 680
- Fat: 26
- Saturated Fat: 12
- Carbohydrates: 38
- Fiber: 3
- Protein: 34
