Preheat the oven to 350 degrees F. Lightly grease and flour a bread pan. (Don't skip this step as the bread has a tendency to stick to the pan if not well greased.)In a large bowl, stir together the applesauce, vanilla extract, melted coconut oil (measure when it is melted not solid), and Greek yogurt until completely combined.Add in the egg and brown sugar. Mix.Add in the salt, allspice, nutmeg, cinnamon (add more spice if desired), baking soda, and baking powder.Peel and finely chop the apple discarding the core. Toss it with the lemon juice and then drain any extra juice. Toss with 1/2 tablespoon of flour and then add to the mixture. Stir in.Add in the white whole wheat flour (white all purpose flour works great too!) and the oat flour.To make the oat flour, blend regular old fashioned or quick oats in a blender or food processor until they resemble a flour. Measure AFTER blending and not before.Stir until JUST combined (don't overmix with the flour added as that makes for a denser bread).Pour into prepared bread pan.Mix the brown sugar and cinnamon together with your fingers and sprinkle evenly to cover the entire bread. Start with 2 tablespoons and use an extra tablespoon of brown sugar if needed.Bake for 55-65 minutes (Mine always takes right around 60 minutes) or until a toothpick when inserted into the center comes out clean.