1. Line a baking sheet with parchment paper; set aside.
2. Peel bananas and cut in half. Gently push Popsicle sticks into thicker end of bananas, leaving out about 1-2 inches to use as a handle.
3. Gently spread yogurt onto bananas to cover completely; place on parchment paper.
4. Use mini chocolate chips for eyes and the larger chocolate chips for the mouth of the ghosts.
5. Freeze until firm, about 2 hours. When serving, allow to thaw for about 2 minutes.
* Serves 6.