Bake cupcakes according to your recipe and let them cool completely.

Frost each cupcake with white frosting, spreading evenly to the edges.

Use black decorating icing to draw four lines across each cupcake to form spider legs.

Press one Oreo cookie into the center of each cupcake where the lines intersect.

Dab a small amount of frosting onto two candy eyes and attach them to the Oreo to finish the spider face.