I found this recipe in a very old recipe box bought at an auction. It had been clipped from a newspaper and was quite yellowed and obviously old.

Brown Sugar Squares
1 egg
1 cup brown sugar (firmly packed)
1 teaspoon vanilla
1/2 cup unsifted all-purpose flour
1/4 teaspoon soda
1/4 teaspoon salt
1 1/2 cups walnuts

Stir together (do not beat) egg, brown sugar and vanilla. Quickly stir in flour, soda, and salt. Blend in coarsely chopped walnuts. Spread in 8×8 greased pan and bake at 350 degrees for 18-20 minutes. Top will be lightly browned, but soft in center when taken from oven.  Cool in pan, then cut into 16 two-inch squares.