1. Butter softened ahead of time
2. Add brown sugar and beat until fluffy
3. Add the sifted cooked egg yolk
4. well mixed
5. Sift in low flour + corn starch + cocoa powder
6. Mix to powder-free state
7. Take a small batter, round it, press a finger print with your index finger, put a few chocolate beans on top of the biscuit, bake at 150 degrees for 20 minutes
