Preheat your oven to 180°C and line a loaf pan with parchment paper, ensuring the sides are covered for easy removal later.
In a large mixing bowl, whisk together almond flour, coconut flour, psyllium husk powder, baking powder, and salt until everything is evenly combined and free of lumps.
In a separate bowl, crack the eggs and whisk them thoroughly until slightly frothy, then add Greek yogurt, apple cider vinegar, olive oil, and warm water, mixing until smooth.
Gradually pour the wet mixture into the dry ingredients while gently folding with a spatula until a thick dough forms.
Allow the dough to rest for 5–7 minutes so the psyllium husk can absorb moisture and firm up the structure.
Transfer the dough into the prepared loaf pan and smooth the top evenly using a spatula.
Place the pan in the oven and bake for 45–55 minutes until the top is golden brown and firm.
Remove from the oven and let the bread cool completely for at least 30 minutes before slicing to avoid a gummy texture.