In a large bowl, whisk together the 1 cup almond flour, 1 cup arrowroot flour, ⅓ cup coconut flour, and 1 teaspoon sea salt.
1 cup almond flour, 1 cup arrowroot flour, ⅓ cup coconut flour, 1 teaspoon sea salt
Heat 1¼ cup filtered water to 105 to 110 degrees F / 40 to 43 degrees C. Add 2 teaspoon maple syrup and stir. Add the 2 teaspoons active dry yeast and let stand for 10 minutes.
2 teaspoon maple syrup, 2 teaspoons active dry yeast
Stir 1½ tablespoon chia seeds and 2 tablespoon psyllium husk powder into the yeast mixture. Let stand for 2 to 3 minutes to thicken, then whisk.
1½ tablespoon chia seeds, 2 tablespoon psyllium husk powder
Pour thickened yeast-chia mixture into the dry ingredients and mix with a wooden spoon until thick and fully combined. The dough will be slightly sticky, but workable. Knead for 1 minute.
Put the kneaded dough back into the bowl. Cover with a damp cloth and place in a warm spot to rise for 1 hour.
Preheat oven to 425 degrees F / 218 degrees C. with baking sheet or baking stone in oven.
Cut dough in half and shape into 2 balls. Place dough balls on a square of parchment paper or cutting board. Mix 1 egg yolk and water to create an egg wash. Brush dough with egg wash. Cut criss-cross pattern on top of dough with knife.
1 egg
Place dough on hot baking sheet with parchment paper or hot baking stone. Bake for 35 to 40 minutes. Baking time can vary. The measure of doneness is an internal temperature of 205 to 210 degrees F / 96 to 98 degrees C.
Let cool completely on a wire rack. Not allowing bread to fully cool before cutting may result in a gummy interior. When cool, slice and serve or store in an air-tight container. To re-crisp crust, toast or reheat in an oven at 375 degrees F / 190 degrees C for 5 to 10 minutes.