Preheat the Oven:
Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter or cooking spray.
Cook the Ground Beef:
In a skillet, melt the butter over medium heat. Sauté the diced onion until soft and translucent (about 3 minutes). Add the ground beef, breaking it apart as it cooks. Season with salt and pepper. Once browned, drain any excess grease.
Assemble the Casserole:
Spread the cooked ground beef evenly in the prepared baking dish.
Spoon the cream of mushroom soup over the beef and spread it evenly.
Layer the potato slices on top of the soup, overlapping slightly.
Sprinkle shredded cheddar cheese generously over the potatoes.
Bake the Casserole:
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