this for a family movie night last weekend. Delicious! It was baked just right to get a good crunch, not chewy. I split the measurements in half to make just one pan and we still have enough left over to munch on the next few days.
1 cup butter
2 cups brown sugar
1/2 cup corn syrup
1 tsp salt
1/2 tsp baking soda
1 tsp vanilla
5 quarts popped popcorn
Preheat oven to 250. Place popcorn in a very large bowl.
In a medium saucepan, melt butter over medium heat. Stir in brown sugar, corn syrup and salt. Bring to a boil, stirring constantly. Boil without stirring 4 minutes. Remove from heat and stir in a soda and vanilla. Pour in a thin stream over popcorn, stirring to coat.
Place in two large shallow baking dishes and bake in preheated oven, stirring every 15 minutes, for 1 hour. Remove and let cool completely before breaking into pieces.