01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium mixing bowl, whisk together the gluten-free flour blend, baking soda, and salt.
03 - In a large bowl, use a hand or stand mixer to beat the softened butter, light brown sugar, and granulated sugar until creamy and pale, approximately 2–3 minutes.
04 - Add the egg and vanilla extract to the creamed mixture, beating until thoroughly combined.
05 - Gradually mix the dry ingredients into the wet mixture, stirring just until incorporated—avoid overmixing.
06 - Fold in the dark chocolate chips and chopped walnuts until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, leaving about 2 inches between each cookie.
08 - Bake for 10–12 minutes, or until the edges appear set and the centers look slightly soft.
09 - Allow cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.