Preheat oven to 350 degrees.

Combine flour, sugar, baking powder, salt, and baking soda in a large bowl.

To a small bowl, add the ground flax and 3 Tbsp water. Stir and set aside.

Zest the oranges. Set the zest aside.

Peel the oranges. Be sure to remove as much of the pith (white part) as you can, or your bread may be bitter. Cutting the peel off with a knife and cutting the segments out is more effective. See a demo here:  https://youtu.be/WrcHe4IG9WU

Add oranges to a blender, and blend at high speed until very smooth. You should have about 2 cups of liquid.

To the dry ingredients, add the flax/water mixture, the orange zest, applesauce, and the liquidized oranges and mix well.

Pulse cranberries in the blender for a quick chop.

Fold cranberries and walnuts into batter until just combined.

Pour batter into greased bread pan, and bake for about 65 minutes, until golden brown and a toothpick comes out clean. Cool in pan for at least 10 minutes before removing.