Preheat your oven to 325°F and line a baking sheet with parchment paper.
In a medium bowl, whisk together oats, flour, baking powder, cinnamon, and salt.
In a separate bowl, whisk the coconut oil, egg, and vanilla. Stir in the maple syrup.
Add the dry ingredients to the wet, mixing until just combined. Gently fold in the apple pieces.
Drop spoonfuls of dough onto the prepared sheet, shaping into circles.
Bake for 11–14 minutes until the centers are set. Let them cool on the sheet for 10 minutes before moving to a rack.