Pop your popcorn in an airpopper, pan, or use microwave popcorn. Sift out any unpopped kernels.
Sprinkle popcorn all over with salt (unless using microwave popcorn)
In a large pan over medium low heat, melt your butter.
Add in the marshmallows and stir constantly until the marshmallows are melted and creamy.
Add in the vanilla extract.
Pour in the popcorn and stir to coat popcorn evenly with the marshmallow.
Pour the popcorn out onto parchment paper.
Sprinkle half of the m&ms, white chocolate chips and sprinkles over the popcorn.
Separate the popcorn into 8 pieces.
Spray your hands with nonstick spray and roll the popcorn pieces into balls.
Press additional m&ms, white chocolate chips and sprinkles into the popcorn balls.
Place balls on parchment and allow to set for about an hour.
Store in an airtight container for 2 to 3 days.