01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the gluten-free flour, baking soda, baking powder, and salt until well blended.
03 - In a large bowl, combine melted butter and brown sugar. Whisk vigorously until smooth and glossy, approximately 1 minute.
04 - Add the egg, egg yolk, and vanilla extract to the butter mixture. Whisk until fully incorporated and uniform in color.
05 - Gradually stir the dry ingredients into the wet mixture using a spatula or wooden spoon. Mix just until combined—avoid overmixing to prevent tough cookies.
06 - Gently fold in the chocolate chips until evenly distributed throughout the dough.
07 - Scoop dough into 2-tablespoon portions, placing them 2 inches apart on the prepared baking sheets.
08 - Bake for 11 to 13 minutes, or until edges are lightly golden brown and centers appear set.
09 - Allow cookies to rest on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.