Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
In a large bowl, cream together the softened butter and granulated sugar until light and fluffy.
Beat in the egg and vanilla extract until well combined.
In a separate bowl, whisk together the gluten-free flour blend, baking soda, salt, and instant espresso powder.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Fold in the chopped almonds.
Drop rounded tablespoons of dough onto the prepared baking sheets, about 2 inches apart.
Bake for 10-12 minutes, or until the edges are golden brown and the centers are set. Let cool on the baking sheets for a few minutes before transferring to a wire rack to cool completely.
Notes
Store cookies in an airtight container at room temperature for up to 3 days.