01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the gluten-free flour, baking soda, and salt until evenly distributed.
03 - In a large bowl, beat the softened butter and granulated sugar until light and creamy, approximately 2-3 minutes.
04 - Add the egg and vanilla extract. Beat until fully incorporated and smooth.
05 - Mix in orange zest, lemon zest, orange juice, and lemon juice until evenly distributed throughout the batter.
06 - Gradually add the dry ingredients to the wet mixture, mixing until just incorporated. Avoid overmixing to prevent tough cookies.
07 - Scoop tablespoon-sized portions of dough and roll into balls. Place them 2 inches apart on the prepared baking sheets.
08 - Gently flatten each ball with your fingertips to achieve desired cookie thickness.
09 - Bake for 10-12 minutes, or until edges are just beginning to turn golden brown.
10 - Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely. Dust with powdered sugar if desired.