Italian Sausage Sandwiches

1 pound mild Italian sausage
1 green bell pepper
1 yellow pepper
2 onions
1 cup marinara sauce
4 (6-inch) hoagie rolls
Minced garlic
Italian seasoning
Extra-virgin olive oil
Cut sausage into six-inch links. Grill approximately 20 minutes on each side until golden brown.
Set sausage aside. Cut onions and peppers into half-moon wedges and place in a large bowl.
Add two tablespoons of minced garlic, 3 tablespoons of Italian seasoning and 1/2 cup of olive oil.
Mix well. Place the mixture of peppers and onions on the grill and sauté until soft. Place the sausage in the hoagie roll, top with onions and peppers, marinara sauce and Parmesan cheese.