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, baking powder, and salt until evenly distributed.
03 - In a large bowl, beat the softened butter with both sugars using an electric mixer until light and fluffy, about 2 minutes.
04 - Beat in the egg and vanilla extract until well combined and the mixture is smooth.
05 - Gradually add the dry ingredients to the wet mixture, mixing just until incorporated. Do not overmix.
06 - Gently fold in the dark chocolate chips and toasted pecans until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, spacing them about 2 inches apart to allow for spreading.
08 - Bake for 10–12 minutes, or until the edges are golden and the centers are just set.
09 - Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.