Preheat oven to 200 degrees
Line a large baking sheet with parchment & set aside
Pop popcorn & transfer to a large bowl - set aside
In a small saucepan, combine sweetened condensed milk & jello packet
Heat over medium until it starts to boil
Allow to lightly boil about 1 minute - stirring constantly
Remove & immediately pour over prepared popcorn
Stir & fold to mix & coat the popcorn
Transfer to prepared baking sheet spreading out as best as you can
Sprinkle with your Disney sprinkles
Bake 20-30 minutes - stir about half way through
Remove & let cool
Break apart & enjoy
Store in a paper bag - not an airtight container to keep from getting soggy