Italian Penne Bake

1 lb box penne pasta
1 lb hamburg
1 med onion, chopped
1 6 oz pkg pepperoni
6 cloves garlic, minced
1 TBS olive oil
1 24 oz jar marinara sauce
1 8z pkg Italian Style cheese blend

Cook pasta according to package directions. Meanwhile, in a large skillet cook hamburg until browned and then add in olive oil, onion, pepperoni, and garlic and cook over medium heat for 5 minutes and then add in marinara sauce and cook until heated through. After pasta is done cooking and drained, return to original pan and pour meat mixture over and mix thoroughly. Spread pasta mixture in lightly greased 13x9 pan, sprinkle with cheese and bake in a 350F oven just until cheese is melted.