1)I used oreo cookies, you can use any of your favorite cookies.
2)First time i made this by just greasing the pan with oil, i found the cake stuck a little to the pan, the next time i lined parchment paper and the cake just popped out easily. So i recommend lining the pan with parchment.
3)My Microwave has a highest power of 800 Watts. It took exactly 5 mins.
4)Your cake should have some moist spots on top and sides of the cake when you remove it from oven, it is normal. It will disappear as the cake cools.
5)Dont add too much sugar or milk than mentioned. It will affect the texture of the cake.
6)Using silicone or plastic baking dish makes the cake pop out easily. Anyway greasing is must for any pan.
7)Let the cake cool completely before inverting, if you remove it when it is hot, it will collapse and break.
8)The cake batter shouldn't exceed more than ¾th of the cake pan.