Separate cream from oreo biscuits. Place the biscuits in a food processor. Process into fine crumbs.

Transfer biscuit crumbs to a large bowl. Add baking powder. Stir to combine.

Add milk to make a smooth batter. Add oreo cream. Stir until combined.

Meanwhile, grease a small saucepan with a little oil. Pour batter into the pan. Cover with a lid. Set aside.

Place a flat pan on the stovetop over low heat. Place the saucepan with batter on this pan. Cook, for about 40-50 minutes or until a skewer inserted into the center of the cake comes out clean. Tip the cake onto a wire rack to cool.

Place cream in a saucepan over low heat. When the cream turns hot (and not boiling), pour it into a bowl of grated chocolate, and stir to melt chocolate. Pour this on the cake. Decorate.