First in a mixing bowl take wheat flour, cocoa powder, jaggery powder, baking powder, salt and mix well.
Next add milk, vanila essence, 1/4 cup milk and mix again to get a lumps free batter.
The batter must be of flowing consistency. Else add 2 tbsp milk more little by little.
Divide the batter into 2 / 3 ovenproof mugs evenly (fill upto 3/4rth).
After that, top each mug with chocolate chunks.
Microwave at high for 2 minutes.
You may do the toothpick test. Just insert a toothpick in the center, if it comes out clean then it is perfectly baked. Else again microwave for 20-30 second more.
Take out from the oven and allow to cool completely.
Serve and enjoy !