Add the coconut milk, apple cider vinegar, and applesauce to a large bowl and mix. Then, add the baking powder, oat flour, and (optional) coconut sugar and use a spatula to stir until combined.
Meanwhile, add all of the apple cinnamon topping ingredients to a saucepan and stir. Then, bring the mixture to a boil in low heat and allow it to simmer for a few minutes, stirring frequently.