In a large bowl, CREAM butter and sugar until light and fluffy.
ADD eggs, one at a time, BEATING well after each addition; BEAT in buttermilk and vanilla.
In a separate bowl, COMBINE flour, baking powder, salt and baking soda; gradually ADD, while BEATING, to creamed mixture.
FOLD in apples and walnuts.
Pour into a greased 9x5-inloaf pan.
HEAT oven to 350°.
In a mixing bowl, COMBINE sugar, flour and cinnamon; CUT in butter until mixture resembles coarse crumbs.
SPRINKLE evenly over batter.
BAKE at 350° until a toothpick inserted in the center comes out clean, about 55-60 minutesLet COOL for 10 minutes before removing from pan to a wire rack.
Per Serving (excluding unknown items): 243 Calories; 12g Fat (42.5% calories from fat); 4g Protein; 32g Carbohydrate; 1g Dietary Fiber; 50mg Cholesterol; 233mg Sodium. Exchanges: 1 Grain(Starch); 0 Lean Meat; 0 Fruit; 0 Non-Fat Milk; 2 Fat; 1 Other Carbohydrates.