Classic Smoked Sausage Mac and Cheese

Name: Classic Smoked Sausage Mac and Cheese
Ingredients: 1 pound cavatappi (corkscrew) pasta, uncooked; 1 tablespoon butter; 1 (14 ounce) package Butterball® Smoked Turkey Dinner Sausage, halved lengthwise, and cut into 1/4-inch-thick slices; 1 cup chopped onions; 3 cups prepared Alfredo sauce; 3 cups half and half; 3 cups cubed pasteurized prepared cheese product; 2 cups shredded sharp Cheddar cheese; 1/2 teaspoon ground black pepper; Cooking spray; 1 cup panko bread crumbs; 1/4 cup butter, melted