1. Add sugar to butter to make it fluffy, and add the broken eggs several times.

2. Soak the coffee powder in a little boiling water, then add coconut milk and mix well, and mix well with the egg liquid after cooling.

3. Mix and sieve the low-powder baking powder, add it into 2, and stir until there is no dry powder.

4. Fill a paper cup in 8 minutes, put it in an oven preheated to 180 degrees, and bake it on the top for 18-20 minutes.

5. Steam the purple potato, press it into a paste, add coconut milk several times, not too much, make it soft and easy to squeeze, put it into a paper bag, and squeeze patterns on the baked cake.