Frost cooled cupcakes.
Split all Oreos as carefully as possible so you don't break them. Place M&Ms on the cream side of the mini Oreos to make eyes and then use frosting to place them onto regular sized Oreos (see photos). Break a mini Oreo circle in half and use frosting to place them as ears. Press the bat "face" into your cupcake and then break a regular Oreo cookie in half to make wings and press them into the frosting!