Cook the pasta according to package instructions until al dente.
In a large skillet, heat the olive oil over medium heat.
Add the pepper sausage to the skillet and cook until browned.
Stir in the diced onion and cook until translucent.
Add the sliced bell peppers and minced garlic; sauté until tender.
Incorporate the diced tomatoes and Italian seasoning; let simmer for 5 minutes.
Combine the cooked pasta with the sausage and vegetable mixture.
Season with salt and pepper to taste, then stir in the Parmesan cheese.
Serve hot, garnished with additional Parmesan if desired.
