Crush oreo cookies and take oreo cookies in a mixer. Powder them.
Now add in baking powder, sugar and milk. Puree them to a smooth mix.
Now take a microwave safe bowl and grease it with oil generously. You can line the bowl with parchment paper and grease the paper, this way the cake will slide out easily.
Pour the batter in the bowl and put it in the microwave on high for 5 mins.
Once it is baked, remove it from oven and let it cool completely before inverting. If you used parchment paper you can invert it earlier.
once it is baked and cooled completely, invert it to a plate decorate with chocolate souce nd cake decoration stars balls etc.