In a medium saucepan on the stovetop, saute the diced onion over medium-high in a couple of drizzles of olive oil. Season with salt and black pepper to your taste. Saute until the onion softens and is beginning to brown, then add the sliced peppers.
Saute for 2-3 minutes, then add the minced garlic, ground beef and Italian sausage. Season the meat with salt and black pepper. Cook until no pink remains and the sausage and ground beef have browned. Drain all excess fat from the pan.
Add the Worcestershire sauce, pizza sauce, Italian seasoning and oregano. Stir well, then cook for another 5-7 minutes until heated through.
Set the oven on the broil setting. Butter and lightly toast the hoagie rolls.
Fill with loose meat and top with slices of provolone or mozzarella cheese.
Return to the oven to melt the cheese.