01 - Preheat oven to 350°F and line two baking sheets with parchment paper.
02 - Whisk almond flour, oat flour, baking soda, and salt in a medium bowl until thoroughly blended.
03 - Beat softened butter and brown sugar in a large bowl until light and fluffy, approximately 2 minutes.
04 - Mix in egg, vanilla extract, and espresso powder until smooth and fully combined.
05 - Gradually fold dry ingredients into wet mixture until just incorporated, being careful not to overmix.
06 - Gently fold chopped almonds and mini chocolate chips into the dough until evenly distributed.
07 - Drop tablespoon-sized dough balls onto prepared baking sheets, leaving 2 inches of space between each cookie.
08 - Press each cookie lightly with fingers or glass bottom to flatten slightly.
09 - Bake for 12 to 14 minutes until edges turn golden brown and centers are set.
10 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool entirely.