Here is an old handwritten recipe on a white index card found in a large box of recipes. You can view a larger image of this recipe by clicking the picture below.
One Egg Wonder Cake
2 cups sifted Swans D Cake Flour*
2 tsp Cal. BPdw.**
1/4 tsp salt
1/3 cup butter or other shortening
1 cup sugar
1 egg unbeaten
3/4 cup milk
1 tsp vanilla
Sift flour once, measure, add B.Pdw. and salt; sift 3 times. Cream shortening, add sugar gradually, cream until light. Add egg and beat well. Add flour alternately with milk in small amounts, beating after each addition. Add vanilla. Bake in greased 8x8x2 in. pan in moderate oven (350°F) 50 min.
*RecipeCurio Note: Swans D Cake Flour would be Swans Down Cake Flour
**RecipeCurio Note: Cal. BPdw would be a brand of baking powder, I’m not sure what “Cal.” stands for though. If you know, please do leave a comment below :).