Seven-layer casserole stacks ground beef, rice, vegetables, and cheese for a hearty, family-style one-dish dinner. This protein-rich, budget-friendly comfort food is a Midwestern potluck tradition.
Preheat your oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish for even heat distribution.
Spread the uncooked rice evenly on the bottom of the prepared dish. Layer the whole kernel corn over the rice to help soak up moisture.
Sprinkle half the kosher salt and black pepper over the rice and corn, ensuring even seasoning.
Dice the green bell pepper and onion, then scatter them evenly on top of the corn layer.
Evenly crumble the raw ground beef over the vegetable layer, pressing gently to distribute. Season the beef with remaining salt, pepper, garlic powder, and dried oregano.
Pour the canned diced tomatoes (with their juice) over the beef layer, covering completely. Add 1 cup of water by pouring gently around the edges to avoid disturbing layers.
Cover the dish tightly with foil and bake on the center rack for 60 minutes. Remove foil, sprinkle shredded cheddar cheese evenly over the top, then return to oven uncovered and bake 15–20 minutes until cheese is bubbly and golden.
Remove casserole from the oven and let rest for at least 10 minutes before slicing, allowing the layers to set for neater portions.