Boil the pasta in a pot of water according to package instructions until al dente.
Melt the butter in a large pan over medium heat.
Add the finely chopped onion to the pan and sauté until softened and translucent.
Stir the pesto, cream cheese, and heavy cream into the pan, mixing well until a smooth and creamy sauce forms.
Add the cooked pasta to the sauce and toss to coat evenly. Serve hot.
Cook it hands-free.
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