Easy and perfect for trick-or-treaters. 1. Flatten large marshmallows. Using a black food writer, draw a skeleton face onto the marshmallows. Set aside to dry. 2. Place a handful of white chocolate pretzels in a bag. Place a marshmallow skeleton head into the bag and seal. 3. Using blank white paper, write or print "Bag of Bones". Cut the label to the width of your bag and fold over. Attach using double-stick tape.