Place the chocolate chips and milk in a microwave safe mug. Microwave for 30-35 seconds, then stir with a fork until the chocolate is completely melted. If the chocolate is not yet melted, microwave for an additional 15 seconds and mix again.
Add in the flour and baking powder, and mix until fully combined. Microwave for 1 minute, and see if it’s done. If not, continue to microwave in thirty second intervals.