Cut red apple into even amount of wedges (do not peel)
Smooth peanut butter on top of each wedge
Place a few mini marshmallows on top of one of the apple wedges (peanut butter side up) then place another apple wedge on top of that, peanut butter side down
When put together, they will look like a smile. The red skin of the apple will look like lips and the marshmallows will look like teeth