Got this recipe from a church cookbook.

Children's Kiddie Oven Chocolate Cake

1 C. sugar
3 T. unsweetened cocoa
1-1/2 C. flour
1 teas. baking soda
1/2 teas. salt
1/3 C. vegetable shortening

Combine the dry ingredients. Stir until blended. Cut in the shortening. (Mixture will look like cornmeal.) Use 1/3 cup per cake. Keeps up to 12 weeks. Use one package of mix plus 4 tablespoons water. Follow oven directions.