01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the gluten-free flour blend, cocoa powder, baking soda, salt, and espresso powder until well blended.
03 - In a large bowl, cream the softened butter, brown sugar, and granulated sugar using an electric mixer until light and fluffy, approximately 2 to 3 minutes.
04 - Beat in eggs one at a time, ensuring each is fully incorporated before adding the next. Mix in vanilla extract.
05 - Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined. Do not overmix.
06 - Gently fold in the chocolate chips and chopped dark chocolate using a spatula until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them approximately 2 inches apart to allow for spreading.
08 - Bake for 10 to 12 minutes, or until edges appear set while centers remain slightly underbaked for optimal fudgy texture.
09 - Allow cookies to rest on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.