01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium mixing bowl, whisk together gluten-free flour blend, cocoa powder, baking soda, salt, and instant espresso powder.
03 - In a large mixing bowl, cream softened butter, granulated sugar, and brown sugar using an electric mixer until light and fluffy.
04 - Beat in eggs one at a time, then add vanilla extract and mix until fully combined.
05 - Gradually add dry ingredients to the wet mixture, mixing until just incorporated.
06 - Fold in semisweet chocolate chips and fudge chunks until evenly distributed.
07 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 10 to 12 minutes, until edges are set and centers remain slightly soft.
09 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.