4 1/2 to 5 qts. popped corn
1/2 c. butter
1/2 c. brown sugar, packed
1/4 c. dark corn syrup
1/4 tsp. salt
1 tsp. vanilla
1/4 tsp. baking soda

Remove any unpopped kernels of corn. Place popcorn in brown paper bag. Place that bag in another large paper bag. (Popcorn must be bagged twice.)

Combine butter, brown sugar, corn syrup and salt in a small saucepan. Place over medium heat on stove and bring to a boil. When syrup comes to a full, rolling boil, begin timing and cook over medium heat for 4 minutes. (Mixture should boil gently over entire surface.) Remove from heat. Stir in vanilla and baking soda; mix well. Pour mixture over corn in bags; stir slightly to combine. Fold ends of bags over several times; shake well.

Place bagged popcorn in microwave oven. Micro-cook on 100 percent power (high) 1 minute. Remove and shake well. Return bag to microwave and cook on high 1 minute more. Shake well. Pour contents out onto foil-lined counter or into a very large bowl. Stir corn as it cools to separate.