Place 4 cookies into a resealable sandwich bag and seal shut. Crush into small pieces. Place crushed cookies into the bottom of a 12 oz or larger microwave safe coffee mug. Add milk and sugar and mix well. Stir in flour, cocoa powder and baking powder until evenly mixed, making sure the batter on the bottom of the mug is mixed well.

Dredge remaining oreo into the batter in the mug, making sure to cover it completely.

Microwave on high for 1 minutes. Remove from microwave and let stand for a few minutes to cool. Serve warm.