1. Add the powdered sugar to the butter and beat with a whisk at low speed, then add the egg whites in portions, beat the butter until fluffy, and then pour the melted coffee powder into the butter paste in portions and beat;
2. According to your preference, you can add vanilla extract, then add the sifted low-gluten flour and almond flour to mix in sequence; stir until there is no dry powder;
3. Put the parchment paper on the baking pan, then put the stirred butter and roux into the squeeze bag and squeeze it onto the parchment paper;
4. Baking cookies: preheat the oven at 190 degrees, and bake the middle layer for 15 minutes.
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