Caramel Popcorn
["8 c. popped popcorn (approximately 1 c. unpopped)", "1 tsp. soda", "1 stick butter", "1/2 c. syrup (light or dark)", "1 1/2 c. brown sugar", "1/2 tsp. vanilla"]
["Pop the popcorn; set aside.", "Preheat oven to 250\u00b0."]
["soda", "butter", "syrup", "brown sugar", "vanilla"]