Preheat your oven to 375°F (190°C).
Cook pasta according to package instructions. Drain and set aside.
In a skillet, cook ground beef over medium heat until browned. Drain excess fat.
Add onion, bell pepper, garlic powder, and Italian seasoning to the skillet. Cook for 3-5 minutes.
Stir in the pizza sauce and cooked pasta. Mix well.
Transfer the mixture to a greased 9x13-inch baking dish.
Top with mozzarella cheese, Parmesan cheese, and pepperoni slices.
Bake for 20-25 minutes or until cheese is melted and bubbly.
Let cool slightly before serving. Enjoy!