Prepare your cupcakes as directed on box. The baking time is generally 14 to 19 minutes. Allow them to cool completely, first in the tin for 5 minutes and then on a wire rack for 1 hour.
Frost each cupcake in a smooth even layer.
Separate an Oreo cookie sandwich and press one cookie half onto the center of each frosted cupcake.
Place two brown M&M's right above the Oreo.
Dip the back of the candy eyes into a bit of the frosting and press onto the top of the Oreo.