3 qt. popped popcorn
1 c. brown sugar
1/2 c. butter
1/4 c. white corn syrup
1/2 tsp. salt
1/2 tsp. baking soda

Spray inside of a large brown paper grocery bag with vegetable cooking spray. Pour popped corn into paper bag.

In a microwave-safe bowl, combine brown sugar, butter, corn syrup, and salt. Microwave on high for 2 minutes. Stir; microwave on high for 2 more minutes. Stir in soda. Pour mixture over the popcorn in the bag. Close bag by folding down top. Shake bag. Microwave on high for 1 minute. Remove bag from oven; shake well. Microwave 1 minute more on high; shake well. Spread to cool. Store Cracker Jack in airtight container.