1. Cover stain paper inside the mold. And brush butter thoroughly.
2. Melt chocolate in the microwave.
3. Add the butter and sugar into the chocolate.
4. Mix until well blended.
5. Put the egg down and stir until well combined.
6. Put cake flour, cocoa powder and stir well.
7. Pour into the mold.
8. Put in the microwave for 4 minutes.
9. Bring out and add 2 kinds of chocolate chips (half for each).
10. Put in the microwave for 3 minutes more.
11. Remove from the microwave. Garnish with remaining of chocolate chips.
12. Set aside to cool for 5-10 minutes (not too cool).
13. Serve in the size as need.