# How-To Steps:
01 - Place Oreo cookies in a microwave-safe mug and crush them completely with a fork until finely crumbled.
02 - Add milk to the crushed cookies and stir until the mixture becomes a thick, soaked paste.
03 - Incorporate flour, sugar if using, and baking powder into the mixture until fully combined.
04 - Add the egg and vanilla extract, then stir until the batter is smooth and homogeneous.
05 - Microwave on high for 1 minute 30 seconds. Check that the cake is set but moist; if necessary, heat for an additional 10 to 20 seconds.
06 - Let the cake cool for 1 to 2 minutes before enjoying directly from the mug.