Instructions: For bottom layer, stir together first 4 ingredients and 1/4 teaspoon salt.

Stir in 6 tablespoons melted margarine. Pat in 11x7-1/2x1-1/2-inch baking pan. Bake at 350 F for 10 minutes. For middle layer, combine granulated sugar, 1/4 cup butter, and chocolate; add egg. Beat well. Stir together 2/3 cup flour, baking powder, and 1/4 teaspoon salt; add to chocolate mixture alternately with a mixture of the milk and vanilla, mixing after each addition. Fold in nuts. Spread batter over baked layer. Continue baking at 350 F for 25 minutes. Cool. Frost with Fudge Frosting. Cut into bars. Top with walnut halves, if desired. Fudge Frosting: In small saucepan melt one 1-ounce square unsweetened chocolate and 2 tablespoons butter or margarine over low heat; stir constantly. Remove from heat; stir in 1 1/2 cups sifted powdered sugar and 1 teaspoon vanilla. Blend in hot water (about 2 tablespoons) to make almost pourable consistency.

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