Easy peasy to make! Make your favorite cake mix, pour into cupcake papers in a muffin pan, bake as directed on your cake mix, then let cool. Frost with chocolate frosting, add M&Ms for the eyes and make the mouth and teeth with sugar cookie frosting. For an extra quick frosting, most grocery stores are carrying a ready to go cookie frosting in a rainbow of colors in a squeezable tube. Tip: Make sure the red hardens before making the teeth or you will have a smeary gross mess.