butter and sugar. Beat in eggs and vanilla. Combine flour, baking soda and salt. Stir into the creamed mixture alternately with buttermilk. Fold in apple and nuts. Pour into a greased 9 x 5 x 3 loaf pan. For topping, combine the first four ingredients; cut in butter until crumbly. Sprinkle over batter. Bake at 350 for 55 60 minutes or until bread tests done. Cool in pan for 10 minutes before removing to wire rack.