Preheat the oven to 350 degrees Fahrenheit and line the baking sheets with parchment paper or spray with nonstick spray.
Combine ⅓ cup butter and 1 cup sugar in the mixing bowl. Cream on medium speed for 2 - 3 minutes until light and fluffy.
Add in 1 egg and mix until well combined.
Add in 1 teaspoon key lime zest, .25 cup key lime juice and .5 teaspoon vanilla. Mix on medium low until well combined.
Add in 2 cup flour, .5 teaspoon salt, .25 teaspoon baking powder, .25 teaspoon baking soda and mix on low. Scrape down sides as needed until well combined.
Scoop out down into golf sized balls and place a few inches apart on the baking sheet.
Bake for 10 minutes, make sure to remove before inches are browned or they will be crunchy.
In a bowl, combine 1 tablespoon key lime juice and .5 cup powdered sugar. Mix until well combined.
Once cookies have cooled, drizzle with glaze and sprinkle lime zest (if desired).
Notes
Tips + Variations
You can either juice your own key limes or buy pre packaged key lime juice.
Make sure not to overmix the dough.
Don't overcook - remove before edges have browned or cookies will be crunchy.
Glaze should be a drizzling consistency, if too thick, add more lime juice.
Storage
These can be stored in an airtight container in the fridge or at room temperature for 5 days.