Butter Crunch Pretzels

16 cups small pretzel twists
1 cup firmly packed brown sugar
1/2 cup butter or margarine
1/4 cup light corn syrup
1 teaspoon vanilla-butter-nut flavoring (or vanilla)
1/2 teaspoon baking soda

Preheat oven to 200 degrees F. Place pretzels in a large roasting pan. Butter sides of a heavy medium saucepan. Combine brown sugar, butter, and corn syrup in saucepan. Stirring constantly, cook over medium-low heat until sugar dissolves. Increase heat to medium and bring to a boil. Cook, without stirring, 5 minutes. Remove from heat. Stir in vanilla-butter-nut flavoring and baking soda (syrup will foam). Pour syrup over pretzels; stir until pretzels are well coated. Bake 1 hour, stirring every 15 minutes. Spread on greased aluminum foil to cool. Store in an airtight container. Yield: about 20 cups pretzels