Microwave white chocolate and milk in a mug for about 40 seconds. Stir until chocolate is completely melted. If you can't get the chocolate to completely melt, microwave for an additional 20 seconds and stir again.
Add in flour, baking powder and sugar and mix until smooth with a small whisk. Add in sprinkles and stir. Microwave for about 1 minute 30 seconds. Top of cake should be dry. Top with a Peep if desired. Let cake cool for about 20 minutes before eating to allow the cake to properly set.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.