Boil a large pot of salted water and cook the rigatoni according to package instructions until al dente. Reserve 1/4 cup of the cooking water before draining the pasta.
Stir in the ricotta cheese until well blended. Add the cooked rigatoni, tossing to combine. If the mixture is too thick, add a splash of reserved pasta water to loosen it.
Let everything heat through for about 1 more minute, then serve warm, garnished with fresh herbs if desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat gently on the stovetop.