Preheat the Oven: Set your oven to 350°F (175°C).
Prepare the Baking Dish: Lightly grease a 9x13-inch baking pan. With butter or nonstick spray.
Layer the Ingredients:
Start with a layer of thinly sliced russet potatoes. At the bottom of the dish.
Drizzle the potatoes with olive oil.
Add a layer of browned and crumbled lean ground beef.
Follow with a layer of sliced onions.
Add sliced tomatoes. Or spread the canned diced tomatoes evenly.
Top with chopped green bell peppers.
Season: Sprinkle each layer with kosher salt. And freshly ground black pepper.
Bake: Cover the dish tightly with aluminum foil. And bake in the preheated oven. For 2 hours.
Serve: Remove from oven. And let it cool slightly before serving. Enjoy your delicious. And hearty casserole!
