Step 1

In a medium saucepan over medium-high heat, saute garlic in hot butter until garlic is just fragrant. Reduce heat to medium and whisk in flour. Slowly whisk in milk and cream until sauce is smooth. Bring sauce to a simmer, stirring occasionally until slightly thickened and bubbly. Remove from heat and stir in nutmeg, spinach, and Parmesan cheese until spinach is wilted and cheese is melted.

Step 2

Transfer sauce to a high-speed blender or food processor and blend several seconds until sauce is completely smooth. Season sauce with salt and pepper to taste.

Step 3

Pour hot alfredo sauce over cooked fettuccine and gradually stir in 1/2 cup reserved pasta water until noodles are evenly coated. Season fettuccine with salt and pepper to taste and serve hot with additional Parmesan cheese. Enjoy!