Easy Pasta Casserole

Directions

1. 1
   Brown meat and onion in large skillet; drain.
2. 2
   If using mushrooms and green pepper, brown them too.
3. 3
   Stir in cooked pasta, spaghetti sauce, garlic powder and half of the Parmesan cheese.
4. 4
   If using pepperoni, chop pepperoni and add it now.
5. 5
   Mix well.
6. 6
   Transfer to 13 X 9 inch baking dish.
7. 7
   Top with mozzarella and remaining Parmesan cheese.
8. 8
   Bake for 20-30 minutes at 375 degrees.