COMBINE popcorn and chopped Butterfinger in large bowl.

MELT butter in medium saucepan over low heat. Stir in marshmallows. Heat, stirring constantly, until marshmallows are melted and mixture is smooth.

POUR over popcorn mixture; quickly toss to coat well. Spray hands with nonstick cooking spray. Form popcorn mixture into six 3-inch balls. Place on waxed paper to cool. Store in airtight container.

Makes 6.