Heat a pan over low-medium heat. Add the oil and the sausages.
Cook for several minutes until all sides are brown. Remove the sausages to a waiting plate.
Add the bell peppers and onion to the hot pan. Cook for 3-5 minutes until they begin to soften, then add the garlic. Cook an additional 30 seconds.
Next, add the tomatoes, Italian seasoning, salt, and pepper. Stir to combine.
Add the sausage links back to the pan, and simmer for 10-15 minutes or until the sausage is cooked through.
Serve hot in a bun, over rice, or with pasta!