#### 1. Preheat the oven:
Preheat your oven to 350°F (175°C). Line an 8x4-inch loaf pan with parchment paper, allowing some overhang for easy removal.
#### 2. Mix the dry ingredients:
In a medium bowl, whisk together the almond flour, coconut flour, baking powder, xanthan gum, and salt. Set aside.
#### 3. Prepare the wet ingredients:
In a large bowl, beat the eggs, melted butter, cream cheese, powdered erythritol, and vanilla extract until smooth and well combined.
#### 4. Combine the dough:
Gradually add the dry ingredients to the wet mixture, stirring until a thick, slightly sticky dough forms. Allow the dough to rest for 5 minutes to let the flours absorb moisture.
#### 5. Shape the dough:
Transfer the dough to the prepared loaf pan. Smooth the top with a spatula or damp hands to create an even surface.
#### 6. Add the egg wash:
In a small bowl, whisk together the egg yolk and water. Brush the mixture evenly over the top of the dough for a golden crust.
#### 7. Bake:
Bake the bread in the preheated oven for 35–40 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
#### 8. Cool:
Let the bread cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.