Overnight Coffeecake

2 cups all-purpose flour
1 teaspoon baking powder
1 teaspoon baking soda
2 teaspoon cinnamon
1/4 teaspoon salt
1 cup granulated sugar
1 cup brown sugar
2/3 cup butter or margarine, softened
2 eggs
1 cup buttermilk (or sour milk)
1 cup apples, peeled, cored,and chopped
1/2 cup chopped black walnuts or pecans

Mix flour, baking powder, soda, salt, and 1 teaspoon cinnamon in a bowl and set aside, in another bowl, cream granulated sugar, 1/2 cup brown sugar, and butter. Mix in eggs, buttermilk, and flour mixture. Fold in apples. Pour into a 9-by-13 inch greasted baking pan. For topping, combine remaining 1/2 cup brown sugar, walnuts, and 1 teaspoon cinnamon and sprinkle over batter. Cover with foil and put in refrigerator until nexr morning. Uncoverand let stand about 30 minutes. Bake 45 minutes in a 350 degree oven. It's best served waarm. Try drizzling coffeecake with a thin powder sugar frosting before serving.