Storage: Cool completely, then store in an airtight container in the fridge for up to 4 days. The sauce (without pasta) can be frozen for up to 2 months. Reheat gently with a splash of water or olive oil.
Vegan: Omit the Parmesan or sub with vegan cheese or nutritional yeast.
Variations: Use red pepper flakes instead of fresh chili; add veggies or protein (shrimp, sausage, mushrooms, tofu). Gluten-free pasta works well here too.