Recipe from PteleaFound in Food that Really Schmecks by Edna Staedler
1/2 cup butter or margarine1 cup brown sugar1 egg1/2 cup cocoa1 cup walnuts (optional)1 tsp vanilla1/2 cup flourpinch of salt
Mix all ingredients in order given and spread into a greased 8″ square baking pan. Bake at 350 F for 20 minutes. Let cool before cutting.
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Recipe from T.O.
3½ cups (packed) icing sugar½ cup cocoa powder¼ teaspoon salt¼ cup milk1 tablespoon vanilla (artificial is fine)¼ pound butter (margarine is possible, but butter works better)1 cup chopped, toasted walnuts (optional)
In 1½ quart mixing bowl, stir sugar, cocoa, salt, milk and vanilla together. Mixture is too stiff to thoroughly blend all [...]

From a great friend
1c corn syrup2/3 c brown sugar2 eggs, slightly beaten¼ c butter¼ t salt2/3 c nuts½ t vanilla
Mix corn syrup with brown sugar in saucepan. Cook gently over direct heat for a good five minutes. This is the important step! If you do not cook long enough, the tarts will not solidify. (Speaking [...]

From a since disappeared cookbook, but “discovered” before that unfortunate event by my little brother
2 eggs, well beaten1 cup sugar1/2 cup butter or margarine, melted1/4 cup cocoa1/2 cup flour1/2 teaspoon salt1 teaspoon vanilla1/2 cup chopped walnuts (optional)
Preheat oven to 275degrees.
Beat eggs well. Add sugar in gradually, beating constantly. Add flour, cocoa, butter -beating with each [...]