1. Preheat oven to 350.
2. Grease 13" x 9" x 2" baking dish.
3. Brown beef and onion in large skillet over medium heat. Drain fat.
4. Mix in spaghetti sauce and noodles.
5. Put mixture in baking dish.
6. Top with cheese. Place pepperoni slices on top of cheese.
7. Bake for 30 minutes, do not cover.
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