Preheat oven to 250ยบ
Pour puffed corn into a large bowl.
Add brown sugar, butter, corn syrup, vanilla and salt in large sauce pan.
Bring to a rolling boil.
Boil 3 minutes. Stirring Constantly.
Remove from heat and add 1T baking soda. Mixture will foam.
Pour mixture over puffed corn and stir. You need to move quickly so it doesn't harden.
Spread mixture on a baking sheet - spread it all out.
Cook for 30-45 minutes, stirring ever 15 minutes.
Dump onto parchment paper and let cool.
Break into pieces and enjoy!