My spouse is obsessed to this meal. We finish eating 1 serving and he speedily goes for another helping

1 tablespoon extra-virgin olive oil
1 ½ pounds sweet Italian sausage, loose
1 (28-ounce) can fire-roasted tomatoes
1 (8-ounce) can tomato sauce
1 onion, sliced
1 red bell pepper, sliced
1 green bell pepper, sliced

Serving suggestion:
16 slices cheese (provolone or mozzarella)
8 hoagie rolls