1/2 cup real butter
2 cups brown sugar
1/2 cup corn syrup
1 teaspoon salt
1/2 teaspoon baking soda
1 teaspoon vanilla extract
4 bags buttery microwave popcorn popped and kernels picked out( you can use regular popcorn but it is not as good)
1Preheat oven to 250 degrees F (95 degrees C). Place popcorn in a very large bowl.
In a medium saucepan over medium heat, melt butter. 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 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 from oven and pour on to wax paper. Let cool completely before breaking into pieces. DO NOT LET COOL IN PAN! It will stick.