-1 Preheat your oven to 350 F.
-1 In a large bowl, whisk together the applesauce, maple syrup, eggs, vanilla and olive oil.
-1 Fold in the almond flour, oat flour, baking powder, baking soda, salt and cinnamon. Stir together until its fully incorporated.
-1 In a small bowl, mix together the ingredients for the cinnamon swirl.
-1 Line a 9 x 5 loaf pan with parchment paper. Pour half of the batter into the pan. Sprinkle the cinnamon sugar over the batter and swirl it in with a toothpick. Cover with remaining batter and gently spread it over with a spatula.
-1 In a small bowl, prepare your crumble by mixing together the oat flour, coconut sugar and cinnamon. Add in the cold butter, and start mixing it together with a fork to create clumps. Once the butter is broken up, you can use your hands to create the crumbs.
-1 Sprinkle the crumb topping over the center of the loaf.
-1 Bake the loaf for 40-45 minutes, until the edges start to brown and a toothpick comes out clean from the center. While it bakes, mix together your icing ingredients until a thick glaze forms.
-1 Let the loaf cool completely for 10-15 minutes, and top of with the icing if using.
-1 Keep stored in a cool place for up to a week, or freeze for up to 2 months.