Spray your heart-pan with cooking spray and set aside.
In a medium-sized saucepan, melt butter over medium heat. Once it is melted, add marshmallows.
Mix constantly until marshmallows have melted. Add 2 small drops of yellow gel food coloring.
Mix until marshmallow mixture is completely tinted. Remove the saucepan from heat and add rice cereal. Fold until cereal is completely coated with marshmallows.
Scoop your rice cereal treat mixture into each heart-shaped cavity and pat it down so it’s packed and flat. Allow to set (about 30 minutes)
Roll out 6 spheres from your white fondant, about ½ an inch in size. Flatten each one slightly.
With your edible black marker, draw one pupil in the center of each fondant eye.
Remove your cereal treats from the heart-shaped pan. Place one eye in the center (usually, the rice cereal treats are sticky enough to hold it, but you can add some decorating frosting on the back of the eye to secure it further).
Using Wilton tip #8, frost each cereal treat with black decorating frosting. Make a contour around each eye and then add lines on each side (these act like their goggles).
Change the frosting tip to Wilton tip #5 and give your cereal treats some “hair” on the top. Serve and enjoy!