Carmel Corn

3 Quarts popped popcorn, keep warm in 225F oven
Over med. heat cook the following to boiling, stirring. Then cook 5 min. w/o stirring:
1/2 C butter
1/2 C Karo syrup
1/2 C brown sugar
1/2 t. salt

Quickly add:1/2 t. vanilla and 1/2 t. baking soda.
Stir. Add to warm popcorn. Stir. Cook 1 hour, stir every 15 min. If the sugar cracks, it cooked too warm or too long.