1 cup butter (do not substitute)
2 cups brown sugar, packed
1/2 cup corn syrup (I use white)
1 teaspoon salt
1/2 teaspoon baking soda
1 teaspoon vanilla extract
6 quarts popcorn (I use 2 bags of micro)
Melt butter. Stir in sugar, syrup, and salt. Bring to boil, stirring. Boil 5 minutes without stirring.
Add vanilla extract and baking soda (will foam up.) Pour over corn and bake at 250 degrees F for 1 hour, stirring every 15 minutes.
Pour out on large cookie sheet to cool.