1. Crushed Oreo cookies, crush them with a rolling pin. (Don't crush it too much, otherwise it will become powdery)
2. Heat the milk and sugar and stir until the sugar melts
3. Pour into the beaten egg yolks (stir while pouring), turn off the heat immediately after boiling
4. Whip the cream until eight
5. Mix it with room temperature egg milk
6. Sift in a teaspoon of black cocoa powder
7. Add Oreo cookie crumbs
8. Finally, stir evenly and install the mold
