Cook pasta according to package directions. Drain pasta well.

Brown ground beef with onion, garlic,and Italian seasoning. Preheat your oven to 350°F.

In a large bowl, mix together pizza sauce and water. Add in cooked pasta, 1 1/2 cups mozzarella cheese, and 20 slices of pepperoni that have been sliced in half. Stir well.

Spray an 8x8 baking dish with nonstick cooking spray. Pour in pasta mixture. Sprinkle with remaining 1/2 cup of mozzarella cheese. Llace the remaining pepperoni slices on top.

Cover with aluminum foil. Spray the inside of the aluminum foil with nonstick spray so the cheese doesn't stick to it while baking.

Bake at 350 for 20 minutes. Remove aluminum foil and bake for another 5-10 minutes (until cheese is melted).

You can substitute the jar of pizza sauce and water for one jar of spaghetti sauce.