Spray a large bowl with cooking spray and add the cereal and set aside.
Place the butter and marshmallows in a large microwave-safe bowl.
Heat on high for 1 minute. Stir the marshmallows until they start to melt. Heat for an additional 15 seconds and let the bowl sit in the microwave for one minute. Stir the marshmallows very well until smooth, using the residual heat to fully melt the mixture.
Stir in the molasse and spices.
Pour the mixture over the cereal and mix very well.
Transfer the treats to the baking tray and use a greased spatula to flatten the treats into a rough rectangle about 10-inches by 12-inches and ½-inch thick.
Chill for 10 to 15 minutes.
Cut out circles as closely together as possible. Chill the circles until the treats are fully set, about 30 to 60 minutes.
to decorate your treats
Assemble a decorating with the tip and fill with icing. Close tightly with a rubber band.
Pipe two dots and top with the candy eyes. Pipe the smile and place confetti sprinkles at each side. Add a squiggle at the top.
Let the icing dry very well.
Notes
stove-top version
In a saucepan, place the butter over medium-low heat. After about half of the butter is melted, add the marshmallows. Continue to heat, stirring well, until most of the marshmallows are melted. Remove from the heat and keep stirring until the mixture is very smooth. Follow the rest of the instructions above.