Start by preheating the oven to 375F and lining a muffin tin with paper liners.
In a large bowl, whisk together the oat flour, cinnamon, baking soda, baking powder, and salt.
In a separate bowl, combine the applesauce, melted coconut oil, egg, honey, water, and vanilla
Pour the wet ingredients into the dry and mix until just combined. Fold in the chopped apples.
Fill the muffin cups ¾ of the way and top with turbinado sugar, if desired.
Bake for 18-20 minutes or until an inserted toothpick comes out clean.
Allow to cool for 5 minutes before removing them to a wire rack.
