My Grandma's Sour Cream Cake

1 1/2 cups cake flour
1 tsp. soda
1/2 tsp. salt
1 c. sugar
1 c. sour milk
1 well-beaten egg
Blend in 2 squares unsweetened chocolate
2 T. melted butter
Add 1 tsp. vanilla last.

Bake at 350 degrees for 35 min.