Preheat the oven to 350 degrees F. Lightly grease a 12-cup muffin tin with or line with paper or silicone liners.
In a large bowl, mix together the applesauce, honey, eggs, coconut oil, and vanilla. In a separate bowl, whisk together the oat flour, baking powder, baking soda, chai spice or other spices, and salt.
Add the flour mixture to the bowl with the wet ingredients and stir just until combined. It's okay if the batter is not entirely smooth. Gently fold in the oats, apples, and walnuts.
Divide batter evenly, filling cups almost to the top. Sprinkle the tops with maple flakes or coarse sugar, if desired. Bake for 20 to 25 minutes, until a toothpick inserted into the center, comes out clean.
Take the muffin tin out of the oven and place on a wire cooling rack to cool for 10 minutes, before removing the muffins from the pan. Cool on the wire rack or enjoy a sneaky muffin warm, with butter.