For a richer flavor, use heavy cream instead of half-and-half. If you don't have campanelle pasta, you can substitute another short, curly pasta shape like cavatappi or rotini. To add a little more depth of flavor, try browning the butter before adding the onion and garlic. For a vegetarian option, omit the sausage and add sautéed mushrooms or spinach to the sauce. This dish can be made ahead of time and reheated. Store in an airtight container in the refrigerator for up to 3 days.