Spread peanut butter on several saltine crackers and line them up on a cookie sheet. Place half of a large marshmallow on an equal number of saltines lined up along side the peanut butter ones. Put cookie sheet under the broiler. Watch constantly, it does not take long. Remove from oven when the marshmallows turn medium brown. By then the peanut butter will be soft. Place a peanut butter saltine cracker atop each marshmallow – peanut butter side down onto the marshmallow – and press slightly. Careful about the hot sugar from the mallows as it squishes out a bit. Note: can be messy to eat as the marshmallow strings out with nearly every bite and crackers crumble. Kids love them. (This big kid does, too.)