Sift flour, soda, baking powder and salt.
Cream short, slowly beat in egg yolks and vanilla.
Add cocoa.
Add flour mixture alternately with sour milk.
Fold in stiff beaten egg whites.
Pour into 2 greased layer pans and Bake 25 minutes at 375. or use 9” square.
Grandma probably used a wood cook stove for this.