Baked Caramel Corn
["1 c. butter or margarine", "1/2 c. light or dark corn syrup", "1/2 tsp. soda", "6 qt. popped corn", "2 c. firmly packed brown sugar", "1 tsp. salt", "1 tsp. vanilla"]
["Melt butter over low heat; stir in sugar, corn syrup and salt. Bring to a boil, stirring constantly.", "Let boil 5 minutes without stirring.", "Remove from heat; stir in soda and vanilla.", "Gradually pour over corn.", "Mix well.", "Turn into two large baking pans.", "Bake in slow oven (250\u00b0) 1 hour, stirring every 15 minutes.", "Remove from oven; cool completely.", "Store in tightly covered containers."]
["butter", "light", "soda", "corn", "brown sugar", "salt", "vanilla"]