01 -
Stir the flour, baking powder, and salt together in a bowl. Put it aside for now.
02 -
With your electric mixer running at medium, whip the butter, sugar, and coconut until it's fluffy and pale.
03 -
Drop in eggs one by one, blending thoroughly after each. Pour in the key lime juice, coconut extract, and half your lime zest. Whip it up for 1 minute on medium-high and scrape the sides so everything mixes evenly.
04 -
Turn your mixer down low and slowly add the dry stuff, mixing just until it comes together.
05 -
Stick the cookie dough in the fridge for about 20 minutes so it's not too sticky to work with.
06 -
Heat your oven to 350°F (175°C) and put silicone mats or parchment on your baking sheets. Mix the sugar dust with the rest of your lime zest in a small bowl.
07 -
Using a small scoop (about 1 1/2 tbsp), make balls from the cold dough. Roll each one in the sugar dust and lime zest mix until they're completely covered.
08 -
Set the cookies on your prepared sheets, leaving 2 inches between them. Bake for 12–15 minutes until they puff up, get firm edges, and start to flatten out.
09 -
Keep the cookies on the hot sheets for 5 minutes, then move them to a wire rack to finish cooling.