In a mixing bowl, combine the warm water, maple syrup, and yeast. Let the mixture sit for 5–10 minutes until foamy.
In a separate large bowl, whisk together the gluten-free flour blend, arrowroot starch, flaxseed meal, buckwheat flour, xanthan gum, salt, and baking powder.
Add the eggs, egg whites, olive oil, and apple cider vinegar to the yeast mixture.
Pour the wet ingredients into the dry ingredients and mix until a thick batter forms.
Transfer the batter to a lined loaf pan and smooth the top. Sprinkle sesame seeds over the surface.
Cover loosely and let the dough rise for 35–45 minutes or until slightly puffed.
Meanwhile, prepare a 9" x 5" baking pan by spraying the pan with cooking spray.
Preheat oven to 375°F (190°C). Bake the risen loaf for 45-50 minutes, or until an instant-read thermometer reads 205–210 F.
Remove from the oven and cool in the pan for 10–15 minutes before transferring to a wire rack.
Allow the bread to cool fully before slicing to avoid crumbling or a gummy texture.
Notes
Finely ground flaxseed meal gives the best texture.
Because gluten-free flour blends absorb moisture at different rates, the batter’s thickness may vary.
The egg whites help lighten the loaf and reduce density.
If the bread feels gummy, it likely needs more baking time or longer cooling.
Store flaxseed meal in the refrigerator or freezer to prevent oxidation and bitterness.
Doneness Cues
The top should look firm and lightly golden.
The loaf should sound slightly hollow when tapped.
The center should feel set, not soft or wet.
A thermometer inserted into the center should read about 205°F–210°F.
Storage
Store the bread tightly wrapped at room temperature for up to 2 days.
Refrigerate for up to 5 days for longer freshness.
Freeze individual slices for up to 2 months.
Reheat slices in a toaster or skillet for the best texture.