Mocha Cake

2 Eggs
2 teaspoons baking soda
2 cups sugar
3 cups sifted flour
1 cup butter
4 tablespoons cocoa
2 cups sour milk
2 teaspoons vanilla
Cream eggs, sugar and vanilla. Alternate dry ingredients with the sour milk. Pour into a 9 x 9 greased pan and bake for about 45 minutes. I frosted my cake with some leftover buttercream frosting from another recipe.