Citrus Butter Cookies

Ingredients
Cookies
2 cups (4 sticks) salted butter, softened
1 1/2 cups sugar
2 whole large eggs, separated
4 cups all-purpose flour
3 Tbsp. orange, lemon, and lime zest
2 Tbsp. orange, lemon, and/or lime juice (2 Tbsp. total)
Icing
3 cups powdered sugar
2 Tbsp. whole milk
2 Tbsp. orange, lemon, and lime zest
Juice of 1/2 lime
Juice of 1/2 lemon
Dash of salt
Extra zest for decorating

Instructions
Preheat oven to 350°F.

Cream butter and sugar until combined. Add egg yolks until combined.... (set whites aside for the icing). Add the zest and the flour and mix until combined, then add juice and mix until combined.

Scoot out heaping teaspoons of dough, then roll them into balls between your hands. Place on a cookie sheet and bake for 13 minutes. Remove from the oven and keep on the cookie sheet for 3-4 minutes. Remove from the pan with a spatula and allow to cool completely before icing.

To make the icing,  combine 1 egg white with the rest of the icing ingredients. Whisk Thoroughly until combined, adding either more powdered sugar or more juice until it reaches a pourable, but still thick, consistency.

Drizzle the icing across the cookies in several lines, then do it again in the other direction. sprinkle with extra zest before the icing sets.

via Pioneer Woman