Servings: 6 to 8

- 1 cup Almond flour - 1 cup Almond flour
- 1/4 cup Coconut flour - ¼ cup Coconut flour
- 2 tsp baking powder - 2 tsp baking powder
- 1/4 tsp Sea salt - ¼ tsp Sea salt
- 1/3 cup Butter (or 5 tbsp + 1 tsp; measured solid, then melted; can use coconut oil for dairy-free) - ⅓ cup Butter (or 5 tbsp + 1 tsp; measured solid, then melted; can use coconut oil for dairy-free)
- 12 large Egg white (~1 1/2 cups, at room temperature) - 12 large Egg white (~1 ½ cups, at room temperature)
 
OPTIONAL INGREDIENTS (but recommended) OPTIONAL INGREDIENTS (but recommended)
- 1 1/2 tbsp Erythritol (can use any sweetener or omit) - 1 ½ tbsp Erythritol (can use any sweetener or omit)
- 1/4 tsp Xanthan gum (for texture) - ¼ tsp Xanthan gum (for texture)
- 1/4 tsp Cream of tartar (to more easily whip egg whites) - ¼ tsp Cream of tartar (to more easily whip egg whites)

Preheat the oven to 325 degrees F (163 degrees C).
Line an 8 ½ x 4 ½ in (22x11 cm) loaf pan with parchment paper, with extra hanging over the sides for easy removal later.
Combine the almond flour, coconut flour, baking powder, erythritol, xanthan gum, and sea salt in a large food processor. Pulse until combined.
Add the melted butter (or coconut oil, which is what I used). Pulse, scraping down the sides as needed.
In a very large bowl, use a mixer to beat the egg whites and cream of tartar (if using), until stiff peaks form. Make sure the bowl is large enough because the whites will expand a lot.
Add ½ of the stiff egg whites to the food processor. Pulse a few times until just combined. Do not over-mix!
Carefully transfer the mixture from the food processor into the bowl with the egg whites, and gently fold until no streaks remain. Do not stir. Fold gently to keep the mixture as fluffy as possible.
Transfer the batter to the lined loaf pan and smooth the top. Push the batter toward the center a bit to round the top.
Bake for about 40 minutes, until the top is golden brown.
Tent the top with aluminum foil and bake for another 30 to 45 minutes, until the top is firm and does not make a squishy sound when pressed. Internal temperature should be 200 degrees.
Cool completely before removing from the pan and slicing.

Calories: 82  Calories: 82
Fat: 7g  Fat: 7g
Total Carbs: 3g  Total Carbs: 3g
Net Carbs: 1g  Net Carbs: 1g
Fiber: 2g  Fiber: 2g
Sugar: 1g  Sugar: 1g
Protein: 4g  Protein: 4g