Prepare 2 baking sheets by lining with parchment paper or a silicone mat.
Using a stand-mixer with the paddle attachment, begin creaming the butter and granulated sugar until light and fluffy- approximately 2 - 4 minutes on medium speed (note: a hand mixer may also be used). Scrape the bowl as needed.
Add the egg and lime juice and mix on low speed until incorporated.
Add the flour mixture and mix on low speed until combined.
Place ½ cup of granulated sugar and the zest from one lime in a small bowl. Rub together with your finger tips to infuse the lime flavor into the sugar.
Scoop cookie dough using a small cookie scooper (approximately 1 ½ tablespoon per cookie). Roll each cookie in the lime sugar.
Place cookies on the prepared cookie sheets. Leave approximately 2 inches of space between each cookie.
Bake cookies for 12 - 14 minutes or until the tops are a pale golden color.
Let cookies cool on the baking sheets for 5 to 10 minutes, then transfer them to a wire rack to cool completely.
Notes
Store the gluten free lime cookies in an airtight container. The cookies stay fresh at room temperature for up to 5 days. Alternatively, to freeze, wrap the cookies well in plastic or foil and freeze for up to 3 months.
Use a light hand when rolling the cookies in the lime-infused sugar. You just want a light coating on each cookie before baking.