In a microwave safe coffee mug, mix together all purpose flour, powdered sugar, cocoa powder, baking soda, salt and mix well. Now add, cooking oil, essence, milk to it and mix well with spoon to form a smooth batter without any lumps.
Finally add the chocolate chips and give a quick stir and microwave (Max Power) for 2 Minutes (Mine is 800 Watts Microwave) Check after 1.5 Minutes, if the cake looks wet then keep for another 30 seconds.
The timing depends on the microwave you use, so increase or decrease accordingly.
Instant eggless chocolate cake is ready. Cut into pieces and serve warm with some vanilla ice cream on top.