Bring a large pot of salted water to a boil. Cook pasta until al dente, and reserve 1 cup of pasta water before draining. Drain and set aside.
While pasta is cooking, make the pesto. Add basil leaves, pine nuts, extra virgin olive oil, parmesan cheese, garlic, salt, and black pepper to a food processor, and pulse until combined.
Heat a large skillet or pot over low heat. Add butter, pesto, and heavy cream. Mix well.
Add pasta to the skillet. Mix pasta and sauce together. Add reserved pasta water 1 tablespoon at a time until you reach your desired consistency.
Top with additional parmesan cheese and serve.
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