Preheat the oven to 375 degrees Fahrenheit. Line a loaf pan with parchment paper.
In a blender, add chia seeds, hot water, orange juice, applesauce, and coconut oil. Allow to soak, set aside.
In a large bowl, add almond flour, oat flour, arrowroot starch, baking soda, baking powder, salt, and coconut sugar. Whisk to combine.
Next, add vanilla extract to the mixture in the blender, and blend on high until smooth. Fold liquid mixture into the dry mixture. Once evenly combined, fold in diced cranberries and orange zest.
Transfer batter to loaf pan and smooth top with spatula. Bake for 50-55 minutes, or until a toothpick comes out mostly clean. Tent loosely with foil at about the 35 minute mark to keep from over browning.
Allow bread to cool completely in pan on a wire rack before glazing and slicing.
Orange Glaze
Once the cranberry orange bread is completely cool, whisk together glaze ingredients in a small bowl until mixture is smooth. Pour over bread, smoothing with the back of a spoon, if necessary. Sprinkle with nuts, if using. Allow glaze to completely set before slicing.