In a small bowl, combine milk with instant coffee powder and stir until dissolved, then set aside. In another bowl, mix butter, sugar, and salt with a spatula until combined.
Once the powdered sugar is incorporated into the butter, switch to a hand mixer and beat until the mixture looks pale and creamy. Add the egg yolk and mix well. Sift in the flour and cornstarch, gently fold with a spatula to prevent scattering, then continue mixing with the hand mixer until smooth.
Pour in the prepared coffee mixture and sift cocoa powder directly into the dough. Mix again with the hand mixer until fully combined. Cover the bowl and chill the dough in the refrigerator for at least 30 minutes.
Once chilled, the dough will be easier to shape. Scoop about 1 teaspoon (around 5 grams) of dough and roll it into an oval shape. Press the back of a knife or spatula into the center to create the signature coffee bean line. Arrange on a baking tray and bake in a preheated oven at 338°F (170°C) for 14–16 minutes. Let the cookies cool on a wire rack, then store in an airtight jar. Enjoy your homemade coffee bean cookies!
Video
Notes
Chill before shaping – Letting the dough rest in the fridge makes it firmer and easier to roll into the classic bean shape.
Keep it even – Use a teaspoon or weigh about 5 grams of dough for each cookie so they bake evenly.
The signature line – For the iconic coffee bean look, press gently with the back of a knife or a skewer. Don’t cut too deep—just enough to leave an indentation.
Watch the bake time – These cookies are small and bake quickly. Remove them from the oven when they’re just set; they’ll continue to firm up as they cool.
Boost the flavor – If you like a stronger kick, dissolve the instant coffee in less milk or use espresso powder.