Place 16 cups popped corn in large paper bag after it is popped. Do not pop corn in a paper bag as it could start a fire!
Combine the brown sugar, corn syrup, margarine, and salt in an 8 cup batter bowl; microwave on full power for 2 minutes. Stir well. Microwave 3 minutes, stirring after each minute. Add vanilla and baking soda. Stir well and pour over the popcorn in the bag.
Shake well and microwave on full power (fold bag ends together) 1 minute; shake bag well and close. Microwave 1 minutes; shake bag well and close. Microwave 30 seconds; shake bag well and close. Microwave another 30 seconds; shake bag and close again. Pour out on foil and let cool after separating. Store in an airtight container.
By Robin from Washington, IA
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