01 -
Preheat oven to 350°F. In a small bowl, whisk together flour, salt, and baking soda. Set aside.
02 -
Combine unsalted butter, brown sugar, and sugar in a mixing bowl. Using an electric mixer on high speed, cream for 1-2 minutes until light and fluffy.
03 -
Add the egg and vanilla extract to the creamed butter mixture, beating until fully combined. Mix in the key lime zest.
04 -
Gradually add the flour mixture in three portions, mixing gently after each addition. Continue only until a cohesive dough forms.
05 -
Roll the dough into 1½-inch balls and place them on a parchment-lined cookie sheet. Bake for 8-10 minutes. Allow cookies to cool on the sheet for 2-3 minutes, then transfer to a cooling rack.
06 -
Once cookies are completely cooled, whisk together powdered sugar, key lime juice, milk, vanilla, and key lime zest in a small bowl, adjusting liquid or powdered sugar for desired thickness.
07 -
Spread glaze over each cookie using a knife, or dip the tops of the cookies directly into the glaze. Let the icing set before serving.
08 -
Store remaining cookies in an airtight container for 4-5 days.