Step 1

Preheat oven to 350° F.Grease 13 x 9-inch baking pan.

Step 2

Combine granulated sugar1 cup (2 sticks) butter2/3 cup cocoaeggsegg whitevanilla extract and salt in large mixer bowl; beat until light and fluffy. Alternately beat in flour and 2/3 cup evaporated milk just until blended. Fold in nuts. Spread into prepared baking pan.

Step 3

Bake for 20 to 25 minutes or until wooden pick inserted in center comes out clean. Cool completely in pan on wire rack.

Step 4

Combine remaining 1/3 cup baking cocoa and 3 tablespoons melted butter in medium bowl; stir well. Alternately stir in sifted powdered sugar and 1/4 cup evaporated milk. Stir vigorously until smooth. Spread icing over cooled chocolate bars.