Lightly oil an 8 x 4-inch loaf pan with a small dab of whatever oil you have on hand.
Place the warm water and teaspoon of coconut sugar into a small bowl (a 2-cup liquid measure works well). Make sure the water is the right temperature. If the water is too cold the yeast will not become active and if the water is too hot it will kill the yeast. Add the yeast and stir. Proof the yeast by allowing it to stand for 5 to 10 minutes. It should become bubbly, if not start over with fresh yeast and water.
Add nut butter, nectar, , oil, and ground flax seeds. Stir well with a spoon, just until mixed. Allow to sit again for 5 minutes.
Stir in vinegar.
Meanwhile, add flour, starch, chia and salt to a large mixing bowl.
Pour in wet ingredients and stir well to mix thoroughly.
Transfer dough to your prepared loaf pan and flatten top with the back of a spoon. Cover pan with a towel and allow to rest in a very warm spot to rise. I like letting it sit in an UNHEATED oven but any warm spot will do the trick. Let it sit for 60 minutes.
Then, bake in a 350F oven for 35- 40 minutes - until top is golden and a toothpick inserted comes out relatively clean. The bread will firm up and continue cooking out of the oven.
Allow loaf to cool in pan for 5 minutes before removing it from the pan and placing on a wire rack to cool. Cool completely, for an hour, then cut into 16 slices.
Can be stored in an air-sealed bag for 2 days on the counter, in the fridge for 5 days, or in the freezer for up to 2 months. The bread does firm up after 2 days so it's best to heat before enjoying.
Notes
I am sure that any nut butter would do here although I have not tested it. Just make sure the nut butter that you use is runny and not thick. Just as the picture in this post indicates. I did not test this on any other grain. I am not sure if it would work any other way than with teff flour. You can find teff flour in any health food store. I wanted to make this recipe free of xanthum or guar gum as I don't like to use them in my baking. If chia seeds are not an option for you, you can use an equal amount of xanthum gum or guar gum instead.
Recipe by Healthful Pursuit at https://www.healthfulpursuit.com/2013/04/best-gluten-free-bread/