PIZZA CASSEROLE

Ingredients

• 1 (4 oz.) pkg. pepperoni
• 1 (16 oz.) pkg. spaghetti
• 1/2 stick oleo
• 1 can spaghetti sauce
• 1 (4 oz.) can mushrooms, drained
• 1 lb. hamburger
• 1 (8 oz.) pkg. Mozzarella cheese
• 1 chopped onion