McCall's, April 1976
1 cup unsifted unsweetened cocoa
2 cups boiling water
2 3/4 cups 1) all-purpose flour
2 teaspoons baking soda
½ teaspoon salt
½ teaspoon baking powder
1 cup butter or regular margarine, softened
2 1/2 cups granulated sugar
4 eggs
1 1/2 teaspoons vanilla extract
1 pkg (6 oz.) semisweet chocolate pieces
1/2 cup light cream
1 cup butter or regular margarine
2 1/2 cups unsifted confectioners' sugar
1 cup heavy cream, chilled
1/4 cup unsifted confectioners' sugar
1 teaspoon vanilla extract