1¼ teaspoons Calumet Baking Powder
½ teaspoon soda
½ teaspoon salt
4 squares Baker’s Unsweetened Chocolate
1 cup milk
1½ cups sugar
4 egg yolks, beaten until thick and lemon-colored
1 teaspoon vanilla
4 egg whites, stiffly beaten
Sift flour once, measure, add baking powder, soda, and salt, and sift together three times. Add chocolate to milk and heat in double boiler. When chocolate is melted, stir until blended; add ½ cup sugar and cook until thickened, stirring constantly. Cool. Add remaining sugar gradually to egg yolks, beating with rotary egg beater until mixture becomes very thick and light-colored. Add chocolate mixture and flavoring and blend. Fold in flour, a small amount at a time; then egg whites. Turn into two greased 9-inch layer pans. Bake in moderate oven (350°F.) 30 minutes. Spread with Chocolate Butter Frosting ([page 17]).