Using roasted red peppers from a jar saves a lot of roasting time in the kitchen! Look for them near the spaghetti sauces and Italian ingredients or near the canned vegetables in your grocery store. You'll find smoked turkey sausage in links or rings close to kielbasa or other smoked sausage.
Cook and drain fettuccine as directed on package. While fettuccine is cooking, place milk, Creole seasoning and bell peppers in blender or food processor. Cover and blend on high speed until smooth. Pour pepper mixture into 12-inch skillet. Cook over medium heat, stirring occasionally, until mixture thickens. Stir in sausage; heat through but do not boil. Serve sausage mixture over fettuccine. Sprinkle with onions.