Mix 1/2 cup of vanilla yogurt with food coloring (can be any number of colors). In a small plastic cup with sharpie marker draw a monsters face. Put 1/2 cup of tinted in the bottom of cup. Top with crushed Oreos or any type of cookies. This could also be done with ice cream or sorbet and frozen and ready for a snack when your kids are done trick-or-treating while you are going through the candy.