Gather all ingredients and let the butter and egg come to room temperature.
Sift together the gluten-free flour, baking powder and salt. Whisk to combine and set aside.
In a mixer fitted with the paddle attachment, cream the butter until soft. Add 1 cup of granulated sugar and vanilla to the butter and beat until light and fluffy, for about 2 minutes. Scrape down the sides of the bowl as needed.
Add in the egg and beat until combined, making sure to scrape down the sides of the bowl to fully incorporate the ingredients together.
Gradually add in the gluten-free flour, baking powder and salt. Mix on low speed until combined.
Chill the dough in the refrigerator for about 30 minutes.
While the dough is chilling, preheat the oven to 350℉ and line baking sheets with parchment paper or use a silicone baking mat; set aside.
Place ¼ cup of granulated sugar (or colored sugar) into a bowl.
Using a cookie scoop, portion out the dough. Place into the bowl with sugar and roll until completely covered.
Place the dough ball onto a prepared cookie sheet, about 2” apart from one another.
Bake for 12-13 minutes – bake for 8 minutes, rotate pans and bake for another 4 to 5 minutes or until edges are set but the center is still soft.
Let cookies sit on the cookie sheet for about 5 minutes before transferring them to a cooling rack.
Store cookies in an airtight container for up to 2 days or freeze for up to 3 months.
Makes about 2-½ dozen cookies.