For an extra layer of flavor, consider adding a pinch of red pepper flakes to the Alfredo sauce for a subtle kick. Feel free to substitute your favorite vegetables. Steamed broccoli, sautéed mushrooms, or roasted bell peppers would all be delicious additions. If you don't have a rotisserie chicken, you can use about 2 cups of cooked chicken breast, shredded or diced. The Alfredo sauce can be made ahead of time and reheated gently over low heat before serving.