In the bowl of a stand mixer, combine softened unsalted butter, powdered sugar, granulated sugar, and vanilla extract. Beat on low speed initially, then increase to high speed until the mixture becomes light and fluffy.
2
In a separate bowl, combine all-purpose flour with the zest from three lemons and whisk together gently.
3
Add the flour mixture to the butter mixture, mixing on low speed until a cohesive cookie dough forms.
4
Lightly flour your work surface and roll out the dough to approximately half-inch thickness.
5
Cut the dough into snowflake shapes using a cookie cutter and place each piece on parchment-lined baking trays. Chill before baking.
6
Bake in a preheated 350°F oven for approximately 25 minutes until the cookies turn golden brown.
7
Prepare the lemon glaze by combining 1.5 cups confectioner's sugar, 1-2 tablespoons lemon juice, 1-2 tablespoons milk, and soft butter in a bowl. Whisk until smooth.
8
Once the cookies have cooled, dip each one face-down into the lemon glaze to coat. Allow the glaze to set before serving.