01 - Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper or grease thoroughly with butter.
02 - In a large mixing bowl, whisk together almond flour, coconut flour, sweetener, baking powder, baking soda, cinnamon, and salt until evenly distributed.
03 - In a separate bowl, whisk eggs until blended. Add melted butter, almond milk, vanilla extract, and mashed bananas. Whisk until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Fold gently with a spatula until just combined. Avoid overmixing to prevent dense texture.
05 - Fold in chopped nuts or sugar-free chocolate chips if desired, distributing evenly throughout the batter.
06 - Pour batter into prepared loaf pan. Smooth the top surface with a spatula for even baking.
07 - Bake for 45 to 55 minutes until golden brown and a toothpick inserted in the center emerges clean.
08 - Let bread cool in the pan for 10 minutes. Remove from pan and transfer to a wire rack. Cool completely before slicing for clean cuts.