Stir the sauce ingredients together in a medium bowl.
Add hot pasta to the sauce and stir. The heat from the pasta will thicken the sauce. If the sauce is too thin, place the pot of pasta and sauce over low heat and stir for a minute or so, it will thicken up. If it's still too thin, add a pinch of arrowroot powder and gently heat while stirring. If it's too thick, add milk to thin.
Add veggies or other add-ins, if desired.
Season with salt and pepper to taste, and a sprinkle of red pepper flakes. Enjoy!