# Preparation Steps:
01 - Place Oreo cookies in a microwave-safe mug and crush thoroughly with a fork until finely crumbled.
02 - Add milk and stir until the cookies are fully soaked and form a thick paste.
03 - Stir in flour, sugar if using, and baking powder until evenly mixed.
04 - Add egg and vanilla extract if using, mixing until the batter is smooth and uniform.
05 - Microwave the mug on high for 1 minute 30 seconds. Check if set but still moist; if needed, microwave an additional 10–20 seconds.
06 - Allow to cool for 1–2 minutes before enjoying directly from the mug.