from HomeEc in school
1/2 cup margarine
1 cup sugar
1/4 cup Karo syrup
1/4 tsp baking soda
1 tsp ground cinnamon or vanilla
2 quarts popped popcorn (1/2 cup unpopped)
Melt butter in small saucepan. Stir in sugar and corn syrup. Bring to a boil, stirring constantly. Boil without stirring for 4 minutes. Remove from heat. Stir in soda and cinnamon. Gradually pour over popped popcorn, mixing well. Turn into large shallow baking dish or roasting pan. Bake at 250 for 30 minutes, stirring every 10 minutes. Remove from oven. Cool and enjoy.