Step 1

In a 12-inch non-stick skillet, melt butter over medium heat. Add garlic and cook for 30 seconds or until fragrant, while stirring constantly.

Step 2

Stir in flour and cook for 1 minute or until lightly golden, stirring constantly. You want to cook off the raw flour taste. Make sure not to burn it.

Step 3

Gradually add in the half and half, stirring as you pour. Season with salt and pepper, to taste. Reduce heat to medium-low and cook until the sauce thickens about 1-2 minutes. If any lumps form, whisk them out. The sauce should easily coat the back of a spoon.

Step 4

Whisk in lemon juice and zest. Stir in Parmesan cheese and parsley. The cheese should immediately melt into the sauce. Serve immediately.