Split the bananas lengthwise, but don't cut all the way through. The goal is to create a boat to hold the ingredients. Load the bananas 1/4 cup each of the caramel bits, chocolate chips and mini marshmallows. Crumble 1 whole graham cracker onto each loaded banana. Wrap individually in 8-by-10-inch squares of foil, and then place near the campfire to melt the candies. Open up and eat with a spoon.