Add in the dry ingredients into a mixing bowl.
Add in whole wheat flour, Baking Powder, Powdered Sugar. Mix them gently.
Crush one oreo and add in.
Add in Vanilla extract. Add in oil.
Add in the milk and mix gently. Make a thick flowy batter. Pour the mixture into a Microwave safe Mug.
Preheat the Oven to 180 deg C for 10 minutes.
Place the Mug in and Bake at 180 deg C for 15 to 20 minutes or until the tooth pick inserted comes out clean.