Preheat oven to 400°F.
Line a baking sheet with parchment paper or a Silpat mat.
Combine the flour, brown sugar, baking powder, cinnamon, and salt in a large mixing bowl. Mix well.
2 1/2 cups all purpose flour, 1/2 cup brown sugar, 1 tablespoon baking powder, 2 teaspoons cinnamon, 3/4 teaspoon salt
Cut in the butter using a pastry blender or fork until it resembles coarse crumbs.
8 tablespoons unsalted butter
In a small bowl or measuring cup, whisk together the buttermilk and egg.
1/2 cup buttermilk, 1 egg
Pour the wet ingredients into the dry and mix until everything is just moist and sticks together. You can very slowly add a small amount of additional buttermilk, if needed.
Gently fold in the pieces of apple.
1 cup apple
Transfer the dough to a lightly floured work surface.
Shape the dough into 2 round circles, about 1/2 to 3/4-inch high. Cut into 6 triangles with a bench scraper or sharp knife.
Transfer the scones to the baking sheet about 2 inches apart.
Bake for 12-15 minutes or until lightly browned. Let cool.