1-1/3 cups butter, softened2-2/3 cups sugar4 eggs3 teaspoons vanilla extract2 cups all-purpose flour1 cup baking cocoa½ teaspoon saltConfectioners’ sugar, optionalIn a large bowl, cream butter and sugar until light and fluffy. Beat in eggs and vanilla. Combine the flour, cocoa and salt; gradually add to the creamed mixture.Spread into a greased 13-in. x 9-in. baking pan. Bake at 350° for 25-30 minutes or until the top is dry and the center is set. Cool completely. Dust with confectioners’ sugar if desired.