2 c. brown sugar
2 sticks butter
1/2 c. white Karo
8 qts. popped corn
1 tsp. baking soda
1 tsp. salt
1 tbsp. butter flavoring

Preheat oven to 200 degrees. In heavy pan, mix sugar, butter, syrup, salt, and soda; and boil 5 minutes, stirring all the time. Remove from heat and add butter flavoring. Pour over popped corn until well coated. Place in 2 (9 x 13 x 2 inch) pans and place in oven for 1 hour, stirring every 15 minutes.