Place the popped popcorn into a large, buttered bowl.
Make the Caramel Sauce:
In a heavy saucepan, combine the butter, golden syrup, and brown sugar.
Stir well and heat over medium heat until the mixture comes to a boil.
Add the sweetened condensed milk and continue to simmer, stirring frequently, until the caramel reaches the soft ball stage. To check, drop a small amount of the syrup into cold water; if it forms a soft ball, it's ready.
Combine:
Remove the saucepan from heat and stir in the vanilla essence.
Carefully pour the caramel sauce over the popcorn, stirring to coat evenly.
Cool & Enjoy:
Allow the caramel popcorn to cool before serving.
Enjoy your delicious, sweet & crunchy caramel popcorn!