Preheat oven to 250 degrees. Mix the popped corn and peanuts in a
very large bowl. Keep warm in the oven set at 250 degrees.
Melt the butter in heavy saucepan. Stir in the brown sugar, corn
syrup and salt and bring to a full rolling boil, stirring constantly. Boil without stirring for 5 more minutes. Remove from heat.
Stir in Baking Soda and Vanilla, quickly pour over warm popcorn mix.
Stir until well coated. Bake in shallow pan or cookie sheet for 45 minutes,
stirring every 15 minutes.