Preheat your oven to 350°F (175°C) and line a baking tray with parchment paper.
In a large bowl, whisk together gluten-free flour, baking powder, salt, and cinnamon until evenly combined.
In another bowl, beat the softened butter, brown sugar, and granulated sugar together until creamy and smooth.
Add the egg and vanilla extract to the butter-sugar mixture, mixing until fully incorporated. You can also add a splash of maple syrup for extra sweetness if desired.
Gradually fold in the dry ingredients into the wet mixture until a soft cookie dough forms.
Gently fold in chopped pecans so they are evenly distributed throughout the dough.
Using a cookie scoop or spoon, place dough balls onto the prepared baking tray, spacing them about 2 inches apart, and gently press each ball slightly to flatten.
Bake for 12-15 minutes or until the edges are lightly golden, while the centers remain soft and chewy.
Allow cookies to cool on the tray for a few minutes before transferring to a wire rack to cool completely.
Serve warm with ice cream or a glass of Mexican horchata, or store in an airtight container for up to 5 days.