(From the Betty Crocker Cookie Cook Book that we had when I was a kid)
1 cup butter or margarine, softened
1 cup packed brown sugar
1 teaspoon vanilla
1 egg yolk
2 cups Gold Medal® all-purpose flour
1/4 teaspoon salt
2/3 cup chocolate chips
1/2 cup chopped nuts, if desired
1. Heat oven to 350°F. In large bowl, mix butter, brown sugar, vanilla and egg yolk. Stir in flour and salt. Press in ungreased rectangular pan, 13x9x2 inches.
2. Bake bars 25 to 30 minutes or until very light brown (crust will be soft). Immediately sprinkle chocolate chips on hot crust. Let stand about 5 minutes or until chocolate is soft; spread evenly. Sprinkle with nuts.
3. Cool bars 30 minutes in pan on wire rack. For bars, cut into 8 rows by 4 rows.