In a medium bowl, whisk together garlic, eggs, egg yolk, Parmesan, and salt & pepper until well combined.
Add pasta and egg mixture to warmed skillet, constantly stirring. Add 1/4 cup reserved pasta water at a time until a smooth consistency is achieved. The sauce will thicken as it cools.
Plate pasta mixture. Garnish with Parmesan and parsley. Serve and enjoy!