Cereal Tree Trunk: 1) Make the cereal treat mixture. Combine butter, marshmallows, and chocolate chips in a large bowl. Heat in the microwave on high for 30-second increments, stirring after each, until melted. Stir in cereal. 2) Working on a silicone mat, sculpt a tree trunk with a few low branches out of the cereal treat mixture. Brush melted and tempered milk chocolate or melted light cocoa confectionery coating over the tree trunk. Make smaller branches, brush them with chocolate, allow them to dry, and add them to the tree trunk using chocolate as glue. Then allow that to dry and add one more layer of chocolate over top of the branch. 3) Once you've added all the branches, add one more coat of chocolate then refrigerate it for 15-20 minutes until the chocolate sets hard.