This old recipe that I found in my late mother's kitchen is from the early 50s. There is a note with it that says it was the grand prize winner in the 5th Pillsbury Grand National Recipe and Baking Contest. I am assuming that is the earlier version of the Pillsbury Annual Bake-Off Recipe Contest. The note also says this recipe was submitted by a Mrs. Lee in Chillicothe, Ohio.
Bake at 350 degrees for 10 to 12 minutes.
Cream together.....1 cup butter, 2/3 cup firmly packed brown sugar, 1 tsp maple flavoring, and 1/2 tsp salt. Cream well.
Add gradually......2 cups sifted Pillsbury (of course) all-purpose flour and 3/4 cup finely chopped walnuts. Mix thoroughly and chill dough for a few minutes for easy rolling.
Divide dough into three equal parts
Roll out..........1 part at a time on a floured surface. Roll into a large rectangle 12 x 9-inches in size. Cut rectangle into twelve 3x3-inch squares. Cut each square in half, diagonally, to make two triangle. Place on ungreased baking sheets.
Bake..............in moderate 350 degree oven for 10 to 12 minutes. Cool on baking sheet 1 minute. Cool thoroughly on wire rack. Frost with chocolate frosting (recipe follows). Garnish with 1/3 cup finely chopped walnuts.
Melt a 1-ounce square of chocolate in top of a double boiler over boiling water. Add 2/3 cup sweetened condensed milk. Continue to cook 5 minutes, stirring constantly, until thick. Add 1 teaspoon cold water, 1/2 teaspoon vanilla and 1/2 teaspoon maple flavoring. Continue cooking and stirring until of spreading consistency.