In a mixer, blend the Oreo cookies to a fine powder.
Add milk, fine grain sugar, and baking powder. If needed add more milk to make the batter smooth and of pouring consistency.
Grease a microwave bowl with butter and pour the cake batter into it.
Microwave on high for 5 minutes.
To check if it's fully cooked, put a toothpick or knife in the middle of the cake. If the toothpick comes out clean the cake is ready. If not bake for a couple of more minutes.
Once ready, take the cake out and let it cool down. Cut into rectangular slices and enjoy your Oreo cake with a glass of cold milk.
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