Heat your oil while you are getting the ingredients and mixing them so that the Oreo's don't get soggy.
Mix together the Bisquick, egg, and milk (or water) until it reaches pancake consistency. Then dip 2-3 oreos into the batter and coat well. After you have coated them, put them into the oil and wait until they get golden brown, then flip them.
After they are all done, sprinkle with powdered sugar to your likings.