Mallow Popcorn Balls

Melt butter in large saucepan on low heat. Add marshmallows and vanilla; cook until marshmallows are completely melted and mixture is well blended, stirring constantly.

Place popcorn in large bowl. Add marshmallow mixture; toss until popcorn is evenly coated with marshmallow mixture.

Shape into 10 (3-inch) balls with lightly greased hands. Place on sheets of waxed paper; let stand until firm.