In a large pot, bring water to a boil and add salt. Add the penne pasta and cook it to al dente according to the package instructions. Drain and rinse with cold water.
Heat olive oil in a large skillet over medium heat. Add the minced garlic and sauté until lightly golden brown, about 1-2 minutes.
Add the heavy cream, milk or half and half, pesto, chili flakes, salt, pepper, and grated Parmesan cheese to the skillet. Stir and let simmer over medium-high heat.
Add the cooked pasta to the skillet and mix until the pasta is fully coated with the sauce. Heat for another 1-2 minutes.
Serve hot, garnished with extra Parmesan cheese or fresh basil if desired. Enjoy!
Notes
Use fresh basil in your pesto for better flavor.
Don't overcook the pasta; al dente is ideal.
Reserve pasta water to adjust sauce consistency if needed.