Cheesy Beef and Broccoli Bake

Preheat the oven to 375°F.

In a large skillet, heat olive oil over medium heat. Add the chopped onion and cook until softened, about 5 minutes.

Add the ground beef to the skillet with the onions. Cook, breaking up the beef with a stiff utensil, until browned, about 5-7 minutes.

Stir in the minced garlic and cook for another 30 seconds.

Add the tomato sauce, salt, black pepper, and crushed red pepper flakes (if using) to the skillet. Simmer for about 10 minutes, stirring occasionally.

While the beef and tomato sauce mixture is simmering, steam the broccoli florets in a microwave on high for about 5 minutes, or until tender. Let them drain on paper towels.

In an 8x8 inch baking dish, layer the steamed broccoli, then the beef-tomato mixture, and finally, sprinkle half of the cheddar cheese.

Top the casserole with the remaining cheddar cheese and sprinkle parmesan cheese on top.

Bake the casserole uncovered for 20-25 minutes, or until bubbly around the edges and lightly browned on top.

Allow the casserole to rest for about 10 minutes before serving.