Preheat grill to medium heat
Spray the sliced onions and whole peppers with the non-stick-cooking spray
Season the sliced onions and peppers with the oregano, garlic powder, salt and pepper to your taste.
Place the veggies on grill, turning occasionally till they are cooked through - should be no more than 15 minutes
Place the chicken sausage on the grill and turn and cook untill cook through, about 10 -12 minutes total
Add the Italian breads and grill to slightly browned
To assemble the sandwich, add either butter or balsamic to the bread, depending on your preference, and layer the chicken sausage, onions and pepper.