01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium mixing bowl, whisk together gluten-free all-purpose flour blend, baking soda, and fine sea salt.
03 - In a large bowl, beat softened unsalted butter, packed light brown sugar, and granulated sugar until the mixture becomes light and creamy, about 2 minutes.
04 - Incorporate the egg and pure vanilla extract into the butter mixture and beat until thoroughly combined.
05 - Add the dry ingredient mixture to the wet ingredients and mix just until incorporated.
06 - Gently fold in dark chocolate chunks or chips and toasted chopped pecans until evenly distributed.
07 - Using a cookie scoop or tablespoon, drop dough balls of approximately 2 tablespoons each onto the prepared baking sheets, ensuring 2-inch spacing between portions.
08 - Bake for 10 to 12 minutes, or until edges appear golden and centers are just set.
09 - Let cookies cool on baking sheets for 5 minutes before carefully transferring to a wire rack to cool completely.