01 - Bring a large pot of salted water to a boil. Add pasta and cook according to package instructions until al dente. Reserve 1/2 cup of pasta water before draining.
02 - Melt butter in a large skillet over medium heat. Add minced garlic and sauté for 1 minute until fragrant but not browned.
03 - Pour in heavy cream and milk, stirring to combine. Let simmer for 2–3 minutes until slightly thickened.
04 - Add basil pesto and Parmesan cheese. Stir until the sauce is smooth and heated through. Season with black pepper.
05 - Add drained pasta to the skillet. Toss to coat, adding reserved pasta water a little at a time until the sauce reaches your desired creaminess.
06 - Serve immediately, topped with extra Parmesan and fresh basil leaves.