01 - Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper or grease thoroughly with butter.
02 - In a large bowl, whisk together almond flour, coconut flour, sweetener, baking powder, baking soda, cinnamon, and salt until well blended.
03 - In a separate bowl, whisk eggs until frothy. Add melted butter, almond milk, vanilla extract, and mashed bananas. Whisk until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Stir with a spatula until just combined. Do not overmix—the batter should remain slightly thick.
05 - Gently fold in chopped nuts or sugar-free chocolate chips if desired, distributing evenly throughout the batter.
06 - Pour batter into the prepared loaf pan. Use a spatula to smooth the top evenly.
07 - Bake for 45 to 55 minutes, or until a toothpick inserted in the center comes out clean and the top is golden brown.
08 - Let the bread cool in the pan for 10 minutes. Transfer to a wire rack and cool completely before slicing for best texture.