3 sauteed onions peppers philly cheese Recipes

submarine rolls, halved, soft butter (can use more butter if desired), garlic powder (optional), sliced mushrooms, well drained (can use fresh sauteed sliced mushrooms), onion, thinly sliced, green bell pepper, seeded and sliced into strips, seasoning salt (to taste) or white salt & freshly ground black pepper (to taste), sliced cooked beef, mozzarella cheese or 8 provolone cheese

white onion, chopped, green bell pepper , julienned, red bell pepper , julienned, beef tenderloin or 1 1/2 lbs new york strip steaks, sliced paper thin, provolone cheese (smoked preferred ), soft hoagie rolls or 4 soft french baguettes, oil, for sauteeing