Preheat oven to 350°F. Mist a 9x5 loaf pan with nonstick cooking spray.
Whisk the flour, brown sugar, baking powder, baking soda, and salt in a large mixing bowl. In a separate bowl or large liquid measuring cup, whisk the buttermilk, egg and oil.
Fold the liquid ingredients and chopped apples into the dry ingredients. Fold just until mixed. Do not over mix.
Add batter to the loaf pan. Bake 45-50 minutes or until the top is golden and a toothpick to the center comes out clean.
Let cool in the pan 5 minutes before removing.