First, combine and heat brown sugar, butter, corn syrup, and salt in a saucepan.
After 5 minutes, take the sauce off the heat and add vanilla and baking soda.
Add the caramel sauce to a bowl of popcorn and stir to coat.
Transfer the popcorn to two greased baking dishes. Bake at 250ºF for 45 minutes, stirring along the way.
This easy caramel popcorn is perfect for snacking and gifting.