preheat oven to 350

cook pasta as directed and set aside

brown beef with onion 6 to 8 minutes in large skillet over medium-heat heat, season with salt and pepper

combine pasta, pizza sauce, tomato sauce, tomato paste, sugar, garlic salt, and oregano in a large bowl

add beef mixture, stir until blended

place half the mixture in a 8x8 baking dish

top with 1 cup cheese

repeat layers, arrange pepperoni slices on top

bake 25 - 30 minutes