Preheat oven to 350F.
In a mixing bowl, place the oat flour, oats, baking powder, and salt. With a spoon or your hands, mix everything together until the ingredients are combined.
In a separate bowl, grate the apples - you can choose to peel them first or not.
In a food processor, place the dates, tahini paste, chia seeds, non-dairy milk, and vanilla extract, and blend until smooth.
Take the mixture, and the bowl of grated apples, and add them to the dry ingredients. Mix well, until you have a thick batter.
Place the batter into a lined or greased 9×9″ tray and bake for 30 minutes.
Remove the tray and place it to one side to cool down, before cutting into slices.
Once cooled, store in the fridge, where they'll be ready to go when you are!