Heat a large skillet over medium heat
Add a little olive oil
Add sausage links and cook until browned on all sides
Remove sausage from the skillet and set aside
Slice bell peppers and onion into strips
Add more olive oil if needed
Add onions and peppers to the skillet
Cook until softened
Add minced garlic and cook briefly
Slice the browned sausage into pieces or leave whole
Return sausage to the skillet
Add salt, black pepper, and Italian seasoning
Add a splash of water, broth, or marinara if desired
Cover and cook until sausage is fully cooked and flavors combine
Serve hot on its own, over pasta, or in a roll