Give each child two graham crackers and one marsh-mellow.
Have each child build their own Snowman Sandwich (discuss patterning).
Place each child's Snowman sandwich on a baking sheet and place in oven once it is preheated. (It should take less than 5 minutes for the marsh-mellow to brown)
Once marsh-mellow is golden around the edges take the baking sheet out of the oven and let cool for a few minutes.
Once the crackers are cool, serve to children and allow them to "melt their snowman" by pushing the top cracker down and squishing the marsh-mellow.