1/2 c. butter
1/2 c. cocoa
1 1/2 c. brown sugar
1/2 c. hot water with 1 tsp. baking soda added
1 tsp. salt
2 c. flour
1 tsp. baking powder
1 c. sour milk, or add 3 tablespoons vinegar to sweet milk)
1 tsp. vanilla

Cream butter, add cocoa, brown sugar, and water with baking soda. Add flour, baking powder, and salt. Beat in sour milk and vanilla. Pour into greased 9 x 13 inch pan and bake at 350 degrees for 30 minutes.