Preheat oven to 350°F. Spread chopped pecans on a baking sheet and toast for 6-8 minutes until fragrant, stirring halfway through. Let cool completely.
In a medium bowl, whisk together gluten-free flour, baking powder, and salt. Set aside.
In a large bowl, cream butter, granulated sugar, and brown sugar together until light and fluffy, about 3-4 minutes.
Beat in eggs one at a time, then add vanilla extract and maple extract if using, mixing until well combined.
Gradually add the flour mixture to the butter mixture, mixing on low speed until just combined.
Fold in the toasted pecans until evenly distributed throughout the dough.
Drop rounded tablespoons of dough onto ungreased baking sheets, spacing them about 2 inches apart.
Bake for 12-14 minutes until edges are lightly golden. Cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.