Cook pasta in boiling water until al dent e.
Cook sausage, garlic powder, and oregano with onions until juices run clear.
In a lightly greased 9x13 pan, pour a small amount of sauce to coat bottom.
Layer ingredients in this order:
1st layer: 1/3 of pasta, 1/3 of sauce, 1/3 of mozzarella, 2 tablespoons parmesan, sausage and onions.
2nd layer: 1/2 of remaining pasta, 1/2 remaining sauce, 1/2 of remaining mozzarella, 2 tablespoons parmesan, ham.
3rd layer: all remaining pasta, all remaining sauce, all remaining mozzarella, 2 tablespoons parmesan, all the pepperoni (completely covering the top).
Bake 375 for 40 minutes.
Let sit for 5 minutes before serving.
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