Caramel Puffcorn

1 bag (9 ounces) Old Dutch Puffcorn
1 cup butter
1 1/4 cup brown sugar
2/3 cup light corn syrup
1 teaspoon baking soda

 Combine the butter, brown sugar and corn syrup in 2 quart saucepan over medium heat. Add the baking soda. Pour Puffcorn into a large roaster pan, pour caramel sauce over, stirring until mixed. Bake 45 minutes at 250 degrees, stirring every 15 minutes.