Step 1: Prepare Your Mug and IngredientsSelect a microwave-safe mug that holds at least 12 ounces (350ml) to prevent overflow. Crush 4 Oreo cookies (including the cream filling) into small pieces – not too fine, as those chunks will create delightful texture pockets in your finished cake. In your mug, combine the crushed Oreos, flour, sugar, baking powder, and salt. Pro tip: A light spray of cooking oil in the mug before adding ingredients will make cleanup significantly easier!Step 2: Mix the Wet IngredientsAdd the milk, oil, and vanilla extract to your dry ingredients in the mug. Stir everything together until just combined – about 20-30 seconds of mixing will do. The batter should look moist but not runny, with visible Oreo pieces throughout. For extra indulgence, fold in the chocolate chips now. They'll create pockets of melted chocolate within your cake. If you're using a smaller mug, place it on a microwave-safe plate to catch any potential overflow.Step 3: Microwave and ServePlace your mug in the microwave and cook on high power for 70-90 seconds. The exact timing depends on your microwave's wattage – start with 70 seconds for a 1000W microwave. The cake is done when it rises to the top of the mug and looks set but still slightly moist on top. Avoid overcooking, as this will make the cake tough and rubbery. Once done, let it cool for about 1 minute. Top with the reserved crushed Oreo, a scoop of vanilla ice cream, and enjoy while warm! The temperature contrast between the warm cake and cold ice cream creates a divine sensory experience.