This is my wonderful sister-in-law Lynn's recipe. Every time I make them, I think about her. (And how hers always turned out so much better than mine...)
1 cup butter
1 pound brown sugar
dash salt
1 cup corn syrup, light
1 can sweetened condensed milk
1 teaspoon vanilla
Melt butter, stir in sugar and salt; then add syrup. Continue cooking over medium heat. Add milk. Stir constantly over medium heat till firm ball stage. (245-250 degrees) (12-15 minutes). Add vanilla and pour into buttered pan. Let cool. Can add chopped nuts after vanilla if desired.