https://www2.niemanns.com/Recipes/Detail/3621/Mallow_Popcorn_Balls
Yield: 9 popcorn balls
Melt butter in large microwavable bowl on HIGH for 1 minute. Add marshmallows, vanilla and salt. Microwave at HIGH for 1 1/2 minutes until melted and smooth, stirring after 45 seconds. Place popcorn in large bowl; pour marshmallow mixture over popcorn, mixing lightly to coat. With hands lightly greased, shape mixture into 9 (3-inch) balls. Place on waxed paper; let stand until firm.
Please note that some ingredients and brands may not be available in every store.
https://www2.niemanns.com/Recipes/Detail/3621/Mallow_Popcorn_Balls