Spray an 8 x 8 baking dish with PAM Cooking Spray. Spray the inside of a medium sized pot with PAM Baking Spray this will keep the marshmallows from sticking to the inside of the pot. Add butter and marshmallows to a medium sized saucepan and place over medium heat. Stir in marshmallows and butter have melted. Slowly add cereal and stir until mix well.
Pour mixture into the prepared baking dish. Press cereal gently into the pan and make sure you spread out evenly. Sprinkle the chocolate candies onto the top. Place the baking dish in the refrigerator. Let the treats firm up for about 1 hour before cutting.