Pro Tips: Reserve pasta water – it's the secret to a silky, cohesive sauce. Cook pasta al dente. Sauté the garlic and onion until fragrant for the best flavor base. For a lighter version, substitute heavy cream with half-and-half or Greek yogurt (add yogurt off the heat). Adjust red pepper flakes to your spice preference. This dish is easily customizable – add vegetables like spinach or mushrooms.