Melt Hershey's Kisses and Nutella in a small saucepan over low heat, stirring constantly.

Pour Chex cereal into a large paper bag (grocery size) and pour melted Nutella mixture over it. Fold the bag to seal and shake to coat cereal.

Add powdered sugar and pumpkin pie spice until evenly coated.

Spread out on cookie sheet to cool; once completely cool, store at room temperature in an airtight container.