Kick up the heat and try this new take on traditional macaroni and cheese. Giada De Laurentiis bakes her own spicy variation, with Italian cheeses, spinach, tomatoes, and mushrooms.Baked Mac and Cheese Related Recipengredients: * 4 cups uncooked elbow macaroni * 3/4 cup finely chopped onion * 3/4 cup butter, divided * 6 tablespoons all-purpose flour * 4-1/2 cups milk * 4 cups (16 ounces) shredded…