Gather all of your ingredients.
Add your white chocolate chips to a large microwave-safe mug.
Add your milk. Microwave for about 40 seconds. Mix with a small whisk or spoon until chocolate is completely melted.
Add baking powder.
Add oil. Mix all three until batter is smooth.
Break up your Oreos in a plastic bag until only small cookie chunks remain.
Dump your Oreo pieces into your mug cake and mix in.
Microwave for 1 minute.
Let cake cool a few minutes before eating. Enjoy!
Recipe inspired by: http://kirbiecravings.com/2014/06/cookies-n-cream-mug-cake.html