Grease a 20cm-square microwave-safe dish. Line base and sides with baking sheet.If you dont have baking sheet. .grease the dish with butter.
Beat sugar and melted butter in a bowl. Add egg or whisked yougurt and milk . Mix well to combine.
Add flour,baking powder and cocoa powder into another bowl. Mix well to combine. Pour the dry mixture into wet mixture.mix well to combine.
Pour this mixture into the greased microwave safe dish.
Microwave on High Power for 6 to 7 minutes.
Remove and check if the cake is cooked by inserting a toothpick into the middle: if it comes out clean it is ready. Allow cake to stand for 5 mins.
Turn out onto a plate.
For the chocolate sauce, melt the chocolate on Half power for approximately 2 mins, stirring every 30 seconds until melted. Add the cream and mix thoroughly until smooth and glossy.Once the cake is cool, spread over the ganache and scatter with the sprinkles.
The cake will keep for up to 3 days in an airtight
NOTE : Make sure to use a microwave safe dish. Cooking time may vary between microwaves. Check after about 4 minutes by carefully tapping dish cake is done with it's just set with the slightest jiggle. Take care as cake will be hot. If you like this dish please give your valuable feedbacks. Happy Cooking