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["Preheat oven to 350u00b0F.", "Line bottom of 13""x9""x2"" baking pan with wax paper.", "In a small saucepan, bring butter, water, and cocoa to a boil, stirring constantly, until mixture boils; then remove from heat.", "In a mixing bowl, stir together flour, sugar, baking soda, and salt; stir in cocoa mixture.", "Add egg and sour cream; beat on medium speed of mixer until well blended.", "Stir in nuts.", "Pour batter into baking pan.", "Bake until cake tester inserted in center comes out clean (20-22 minutes).", "Cool 10 minutes.", "Remove from pan to wire rack; carefully removing wax paper.", "Cool completely.", "Cut cake into small pieces (2""x1 3/4"" each) (cake will be easier to cut if frozen for several hours or up to several days before cutting).", "Place on cooling rack.", "In a small saucepan, bring butter, water, and cocoa for glaze to a boil, stirring constantly, until mixture boils; then remove from heat.", "Cool slightly.", "Gradually add powdered sugar, mixing until smooth; stir in vanilla.", "Spoon glaze over top of each piece of cake, allowing it to run down the sides.", "Let glaze to set; then decorate with icing, if desired.", "Place in foil cups, if desired."]
