Combine sweetened coconut flakes, flour, salt and 1 Tbsp lime zest in a bowl. Mix thoroughly.
Add key lime juice and sweetened condensed milk. Mix well with a spatula.
Using a #50 scoop (about 1½ Tbsp), scoop cookie dough balls onto a greased or lined baking sheet. Sprinkle the tops of the raw macaroons with the remaining zest on top.
Bake at 350˚F for 12-15 minutes or until the edges and bottom of the cookies are browned. Allow to cool completely. Enjoy!