04In another bowl, stir together flour, cocoa, baking powder and baking soda. With a wooden spoon, stir the dry ingredients into the coffee mixture in batches, alternating with the sour cream, making two additions of dry and one of wet, and stirring just until the mixture is combined. Pour it into a prepared pan. Sprinkle with topping.
05Place the pan in the centre of the oven and bake for 30 to 35 minutes or until a tester inserted in the centre comes out clean.