In a medium bowl, put 1 cup brown sugar, 1/2 cup butter, 1/3 cup corn syrup--do not stir! Microwave for 2 minutes, then stir.
Microwave for 3 minutes, then stir and add 1/2 tsp baking soda.
Pour half the caramel over popcorn in the paper bag. Add the other half of the popcorn, and remaining caramel.
Microwave for one minute, then shake vigorously for 30 seconds.
Microwave for 45 seconds, then shake for 30 seconds.
Microwave for 20 seconds.
Pour onto waxed paper, separate to cool.
