In a bowl: mix the cream cheese and milk together with a mini whisk. In a mug: melt the butter with the chocolate in the microwave for 30–40 seconds (800 watts). Beat the chocolate mixture until smooth, then allow it to cool slightly. One by one, whisk in the egg, sugar, flour and baking powder. Add the cream cheese without mixing too much. Cook in the microwave for 1 minute 30 seconds (800 watts). Allow to cool for 1 minute before eating.