Mix oat flour, buckwheat flour, baking soda, psyllium husk and salt in a bowl.
Add chopped nuts and all seeds to the dry ingredients.
Mix the wet ingredients in a seperate bowl.
Stir in the wet ingredients to the dry and combine well.
Let the batter sit for approximately 30 minutes to give the seeds a chance to soften a bit and become a bit jelly-like.
Preheat the oven to 150 degrees Celsius.
Line a loaf pan with parchment paper.
Pour the batter into the pan.
Bake in the oven for 60 minutes or until a toothpick comes out clean.
Let it cool before taking it out from the loaf pan.