2-3quartspopped popcornall just depends on how coated you want your popcorn
Instructions
In a large, microwave-safe bowl, microwave butter, brown sugar, corn syrup, and salt on high for 2½ to 3 minutes until bubbling.
Remove from microwave and mix in baking soda. Put popped popcorn in a paper grocery sack and pour caramel over popcorn. Fold down top of grocery sack and put in the microwave.
Microwave on high for 1 minute and 20 seconds. Take sack out of microwave and shake to evenly coat the popcorn. Pour out on cookie sheet to cool.