Split waffles into 2 layers. Cut marshmallows in half. Set 3 marshmallow halves on 8 waffle halves. Set another waffle on top of the marshmallows, creating sandwiches. Put four waffles back in the waffle maker and heat for 10-20 seconds until the marshmallows just begin to melt. Remove and repeat with the other 4 waffles.