The psyllium husk powder is not the same as psyllium husks. Make sure you buy accordingly. I chose to top the bread batter with seeds for a more savoury bread.
You could top with rolled oats (just make sure they are gluten free), hemp seeds etc.
This easily freezes, wrapped well in plastic wrap. Store unused chestnut flour in the freezer to avoid it going rancid. It is a delicate flour made from nuts, so really, all nut flours ideally should be stored in the freezer, unless of course you go through them quite regularly.
Adapted from Colourful Eats Nutrition Paleo Brown Bread