Preheat the oven to 350℉/175°C.
In a mixing bowl, combine almond flour, baking powder, baking soda, salt, and ground flaxseeds. Mix these dry ingredients until they are well incorporated.
In another bowl, whisk together the eggs, egg whites, olive oil, honey, and apple cider vinegar. This wet mixture should be well combined.
Slowly add the wet ingredients to the dry mixture. Stir until you achieve a smooth, homogeneous batter.
Grease a bread pan or line it with parchment paper to prevent sticking. Pour the batter into the pan, leveling it out evenly.
Place the pan in the preheated oven and bake for 30-35 minutes or until the bread turns golden brown and a toothpick inserted into the center comes out clean
Once the bread is done, remove it from the oven and allow it to cool in the pan for about 10 minutes. Then, transfer it to a wire rack to cool completely before slicing.