Preheat oven to 350°

Grease the bottom and sides of a 9x13 inch loaf pan. If using a glass loaf pan, bake at 325°

In a large bowl beat the butter and sugars together until combined. Add the buttermilk and baking powder; and beat until combined.

Add eggs and vanilla; and beat until combined. Add flour, apple pie spice and salt; beat until combined.

Toss the apples in a bit of flour before adding to the batter. By hand stir in the apples.

Pour batter into prepared pan and spread evenly. Prepare the streusel topping. In a small bowl combine the brown sugar, cinnamon and flour. Using a pastry blender or fork cut in the butter until it resembles coarse crumbs.

Stir in pecans and sprinkle topping over batter. Bake for 1 hour or until a wooden toothpick inserted near the center comes out clean.