In a mixing bowl, mix all dry ingredients.
In another bowl, mix all wet ingredients.
Mix dry and wet ingredients together.
Split the batter into 2 bowls
Get ready with the cocoa mixture.
In one of the batter, add in the cocoa mixture. Give the batter a good mix.
In the 1st mug, scoop some batter from each bowl into it to form a nice marble design.
Repeat the same in 2nd mug. **The batter look little but it will rise tall in microwave later. Microwave at 1000w for 90secs.
Lightly loosen the edge of the mug and pour the cake out. Enjoy!