Take a bowl mix flour and little sugar...Beat the eggs and keep aside. Now take butter, sugar and egg whites, beatthem.well like to.form creamy texture..Then add the flour, coco powder ,vanilla essence,3tbsp milk,pinch salt and baking powder and mix all together and pour it in the glass bowl by applying butter.. keep.it in microwave for 15 to 20min after that take that out and let it come to room temperature and then keep it fridge for few hours until it gets that cake consistency..