Coat pizza pan, cake pan or cookie sheet with 1 tablespoon butter.
In a large saucepan melt 6 tablespoons of butter over low heat. Add marshmallows and stir until completely melted.
Add green food coloring. Use generously, as the mixture will lighten significantly when cereal is added.
Next, add cereal and stir until well coated.
Pour mixture into buttered pan. Use remaining 1 tablespoon of butter for hands and evenly press mixture into pan. Let mixture cool.
Using a serrated knife or pizza cutter, slice cooled mixture into triangles. They do not have to be uniform, each tree can be unique!
Use green icing to adhere chocolate bar to the underside of Christmas tree.
Set out candies and embellishments of choice and use icing to glue each piece to Christmas tree.