Lay out a sheet of parchment paper on the counter.
Melt butter in a large pot over medium heat. Add mini marshmallows and mix until melted.
Turn off the heat. Pour in OREO O’s® cereal and mix together until combined.
With a spatula, lightly press the treat mixture onto your parchment paper.
Let treats cool about 15 minutes.
With your hands, shape treat mixture into 2 in balls.
Decorate with your favorite colored frosting and add googley eyes to create your own monster!
Enjoy your spooky treat!