I have lost a favorite recipe called One Egg Chocolate Cake (unfrosted, baked in a square pan) It was published in Sunset magazine in the early '70s. Maybe one of your readers could share it?
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One-egg Chocolate Cake
1/4 Cup shortening
2/3 Cup sugar
1 Teaspoon vanilla
1 square unsweetened chocolate, melted
1 1/2 cups flour
1/4 teaspoon salt
2 teaspoons baking powder
1/2 cup milk
Cream together shortening and sugar. Add the egg, vanilla, and melted chocolate and beat thoroughly. Put flour, salt and baking powder into a sifter, and, alternating with milk, add to the creamed sugar. Stir until well combined and pour into an 8 by 8 pan. Bake at 375 for 35 minutes.