01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together gluten-free flour, cocoa powder, baking soda, and salt in a medium bowl.
03 - Beat softened butter with brown sugar and granulated sugar in a large bowl until light and fluffy.
04 - Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
05 - Gradually add dry ingredients to the wet mixture, mixing until just combined.
06 - Fold in semi-sweet and milk chocolate chips until evenly distributed.
07 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 10-12 minutes until edges are set but centers remain soft.
09 - Cool on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.