Next, you’ll want to add in the heavy cream and sour cream. With a spoon or spatula, stir in salt, pepper to taste, Italian seasoning, and red chili flakes. Set pan to low heat and let sauce simmer and thicken for 3-4 minutes. Add in parmesan, stir, then toss in your favorite pasta. If the Tuscan sauce is too thick, add in a bit of the reserved pasta water, 1 tablespoon at a time. Serve and enjoy!