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This one is a classic from a vintage Karo® cookbook.

Quick Facts

Prep Time: 15 minutes
Bake Time: 22 to 26 minutes
Yield: 16 squares


  • 1/2 cup butter OR margarine
  • 3/4 cup sugar
  • 1/3 cup Karo® Dark Corn Syrup
  • 1 teaspoon pure vanilla extract
  • 1/2 teaspoon salt
  • 2 eggs
  • 2 ounces unsweetened chocolate, melted
  • 1/2 cup chopped walnuts
  • 2/3 cup all-purpose flour


  1. Preheat oven to 350˚F.
  2. Cream butter and sugar until light and fluffy. Add corn syrup, vanilla and salt; blend thoroughly. Add eggs one at a time, beating well after each addition. Stir in melted chocolate and walnuts. Fold in flour.
  3. Pour into a greased 8-inch square pan. Bake for 22 to 26 minutes or until edges begin to pull away from the pan. When cool, cut into squares.