3 qts. popped popcorn (2/3 - 1 c. unpopped)
1/2 c. butter
1 c. brown sugar
1/4 c. light Karo syrup
1 tsp. baking soda

Microwave butter, brown sugar and syrup in a 1 3/4 quart bowl on High for 5 minutes. Stir 1/2 way through. After the 5 minutes, stir in baking soda. Microwave for 1 1/2 minutes more. Put popped popcorn in a large paper bag. Pour mixture over the popcorn. Shake well. Place bag in the microwave on High for 1 minute. Pour caramel corn into a bowl or onto a tray. Allow to cool. Break apart. Enjoy.