This recipe is from Carrie, a former neighbor who made it for Christmas. It's easy and at my house, it's gone in no time.
8 c. popped popcorn (about 1/3 c. unpopped)
3/4 c. brown sugar
1/3 c. margarine
3 Tb. light corn syrup
1/4 tsp. baking soda
1/4 tsp. vanilla
Remove all kernels from popped corn. Butter sides of a medium saucepan. In saucepan, combine brown sugar, margarine, and corn syrup. Cook and stir over medium heat to boiling. Remove saucepan from heat. Stir in baking soda and vanilla; pour over popcorn. Stir gently to coat.