Preheat oven to 250º
Melt butter over low heat, and brown sugar, corn syrup, and salt. Bring to a boil stirring constantly. Boil without stirring for 5 minutes (very important).
Remove from heat. Stir in baking soda and vanilla. Gradually pour over popped corn. Mixing well. Turn into 2 layers, shallow baking pan sprayed with Pam, or greased. Bake for 1 hour, stirring every 15 minutes. Enjoy.
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