Grease or butter a 8X8 pan. Pour Cocoa Krispies into a large bowl. In another large microwave-safe bowl, melt marshmallows and butter for 60 seconds. Stir. Repeat until mixture is melted and mixed together. Pour over Cocoa Krispies. Stir, using a wooden spoon, until mixed well. Keep mixing until all the crumbs are incorporated. Pour into prepared pan and press to spread evenly. I find it helps to spray my fingers, or a wooden spoon with cooking spray to press the mixture without sticking. Set aside. Place Andes baking chips in a zip-loc baggie. Place in microwave for 20 seconds. Take out and knead to mix. Repeat until mint chocolate is melted. Cut off a small piece of the corner of the bag and drizzle bars with mint chocolate. I usually place them in the fridge to hurry the process (but if you leave them too long, you will have to let them sit out to soften before cutting). Once chocolate has set, cut into bars and enjoy.