Preheat Oven: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
Make the Cookie Dough: In a bowl, mix flour, almond flour, sugar, baking soda, and salt. Add butter, egg, and vanilla, mixing until dough forms.
Shape the Cookies: Scoop out tablespoon-sized portions of dough. Roll them into balls and place them on the baking sheet.
Bake the Cookies: Bake for 12-15 minutes, or until edges are golden. Let them cool completely on a rack.
Prepare the Frosting: Beat butter, powdered sugar, espresso, and vanilla until smooth and creamy.
Frost the Cookies: Once cookies are cooled, spread the espresso frosting generously on top.