For a vegetarian option, omit the sausage and add a medley of roasted vegetables like butternut squash or mushrooms. To enhance the flavor, toast the spices (cinnamon, nutmeg, and cardamom) in a dry pan for a minute before adding them to the sauce. If the sauce becomes too thick, add a splash more milk to reach your preferred consistency. Garnish with freshly grated Parmesan cheese or toasted pecans for added texture and flavor.