Add vegetable oil to a large pan and heat over medium-high heat. Add sausages and cook until browned on all sides. Remove sausage from pan and set aside.
Add onion and peppers to pan and cook over medium heat until softened. Add garlic and cook for 1 minute.
Return sausages to pan along with all other ingredients. Stir to coat.
Cook for about 10 minutes, until sausage is cooked through and sauce is thickened.
Serve on hoagie rolls, topped with shredded mozzarella cheese.
Recipe adapted from: https://spicysouthernkitchen.com