01 -
Mix the baking soda, salt, and cream of tartar together in a bowl until everything looks evenly combined.
02 -
In another bowl, whip up the softened butter with the white sugar. Use a mixer for about 2-3 minutes until it turns pale and fluffy.
03 -
Stir in the egg, vanilla, lime zest, and lime juice until you don't see any streaks of egg or liquid.
04 -
Slowly add the dry flour mixture to the wet bowl. If you're using food coloring, toss it in now. Shape your dough into a ball and chill in the fridge for 2 hours.
05 -
Preheat your oven to 375°F. Roll the cold dough into 1-tablespoon balls, and coat each piece evenly in a layer of sugar.
06 -
On a parchment-covered baking tray, space the dough balls out so they have room to spread. Bake for 8-10 minutes until the edges turn just golden.
07 -
In a small bowl, melt the butter and mix in lime juice and powdered sugar until the glaze looks completely smooth. Add this to cookies while warm.
08 -
Let everything cool off completely before serving so the glaze sets perfectly.