A quick chocolate treat with Oreo cookies, milk, and vanilla, prepared effortlessly in a mug.
# Step-by-step guide:
01 - Place Oreo cookies in a microwave-safe mug and crush thoroughly with a fork until finely crumbled.
02 - Add milk to the crushed cookies and stir until a thick paste forms and cookies are fully soaked.
03 - Incorporate flour, sugar if using, and baking powder, mixing until well combined.
04 - Add the egg and vanilla extract if desired, mixing until the batter is smooth and uniform.
05 - Microwave the mug on high for 1 minute and 30 seconds. Check that the cake is set but still moist; if undercooked, heat for an additional 10 to 20 seconds.
06 - Let the cake cool for 1 to 2 minutes before enjoying directly from the mug.