Slice peppers and onion, drizzle with olive oil and grill till tender. Set aside.
Slice sausage links and grill till done. Mix with sausage.
Meanwhile boil pasta according to package directions to al dente. Drain, immediately place Parmesan and butter (cut into 1 tbsp slices) into pasta, garlic, salt and pepper to taste. Toss till butter is melted and pasta is well coated. Add parsley and toss again.