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- Preheat the Oven: Set your oven to 375°F. Grease your casserole dish well to prevent sticking and set aside.
- Cook the Beef: In your skillet, brown the ground beef over medium heat until no pink remains, breaking it up as it cooks. Drain any excess grease.
- Add Vegetables: To the skillet, add diced onion, diced green bell pepper, and minced garlic. Cook until the vegetables are soft and the mixture is fragrant.
- Mix Soup and Sour Cream: In a mixing bowl, blend the condensed cream of mushroom soup with sour cream. Season this creamy mixture with salt and pepper to your liking.
- Layer the Potatoes: Arrange a layer of sliced potatoes at the bottom of your greased dish, seasoning each layer with salt and pepper.
- Assemble the Casserole: Spoon the beef and vegetable mixture over the potatoes. Next, evenly spread the soup and sour cream mixture. Sprinkle with shredded cheddar cheese.
- Bake Covered: Cover the dish with aluminum foil and bake for about 45-50 minutes, or until the potatoes are tender.
- Add French Onions: Remove the foil, top with French fried onions, and bake uncovered for another 5 minutes, until the onions are golden and crispy.
- Garnish and Serve: Let the casserole cool slightly before sprinkling with optional green onions or parsley for a fresh contrast.