Whisk together the psyllium husk, sweetener, and water. Whisk until combined and let gel while preparing the flour mixture.
20 g whole psyllium husk, 20 g maple syrup or honey, 300 g filtered water
In a large bowl or stand mixer, combine all of the flours + starches, plus salt. This is also where you'd adding any herbs and other dry seasonings if you want to flavor your dough.
80 g potato starch, 60 g tapioca flour or arrowroot flour, 80 g sorghum flour, 65 g to 80g superfine brown rice flour, 12 g sea salt
Whisk the psyllium gel mixture into the preferment, along with the olive oil if using, and any other wet seasonings (like garlic, soaked nuts or seeds, etc.).
8 to 15 g olive oil
Add the wet ingredients to the flour mixture. Use a spoon and then your hands to bring the dough together, or use your dough hook to mix all of the ingredients until a smooth dough forms. It will take a few minutes in a stand mixer. If you're using your hands, you will likely want to knead the dough together for a few minutes to make sure all the flour is hydrated and the dough is smooth.
Once your dough is soft and smooth, turn it out onto a clean, smooth work surface. Lightly flour it if your dough seems sticky - mine usually doesn't need any flour. Knead into a smooth ball, and use your hands to shape the dough into a round (or whatever shape you're making).
Dust your banneton or tea towel-lined bowl generously with brown rice flour. You can place the dough directly into the banneton if you want the horizontal lines you see on my round loaves, or you can use the liner for a smoother look. See notes section for instructions on making the bread in a loaf pan.
Use a dough scraper or your hands to transfer the dough into your banneton, or a bowl lined with a clean tea towel. Put the smooth side facing down, so the "seams" of the loaf are facing up. Since we'll flip the loaf before baking, the seams will be on the bottom after baking.
Cover, and let the dough proof for about three to four hours at room temperature, or overnight in the refrigerator. (While this timing works pretty consistently for me here in San Diego, other bakers have mentioned that sometimes their bread can take up to 6 to 8 hours to rise well. Remember to look for the soft, puffy texture instead of relying strongly on the exact timing. Conditions of weather, your starter, ingredients, etc. can vary this timing pretty widely!)