Cook until it thickens:

Number 1:

1/3 c. cocoa
1/3 c. melted butter
1/2 c. boiling water

Remove from heat and cool.

Number 2:

Combine:

1/2 c. sour milk
1 c. flour + 1 tsp. salt
1 rounded tsp. baking soda

Sift flour, sugar, soda and add sour milk. Combine Number 1 and Number 2 and then add 1 whole egg and beat well. Add 1 teaspoon of vanilla while beating. Bake in 350 degree oven for about 30 minutes or until a toothpick inserted comes out dry.