Add peanut butter, plant milk and apple cider vinegar. Mix well.
Chop the walnuts and chocolate into smaller pieces.
Add the rest of the ingredients and mix well.
Use a 23 cm / 9 inches loaf tin. Grease the loaf tin or line with baking paper. Add the mixture to the loaf tin and bake for about 45 min. You can test it by sticking a knife and see that the mixture doesn't stick to the knife.
Enjoy.
Notes
* if you don't have psyllium husk you can substitute with 3 tbsp ground flax seed