This eight ingredient Skinny Pumpkin Alfredo Sauce uses common pantry and fridge ingredients which means you can enjoy it any day of the week without making a special trip to the grocery store. Garlic, Parmesan cheese, chicken broth and Greek yogurt are thickened into an amazing creamy sauce. Once you stir in pumpkin puree and a sprinkle of ground nutmeg, well, an autumn pasta favorite is born.