01 - Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper or grease thoroughly with butter or cooking spray.
02 - In a large mixing 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. Stir until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Fold together using a spatula until just combined, being careful not to overmix the batter.
05 - Gently fold in chopped nuts or sugar-free chocolate chips if desired, distributing evenly throughout the batter.
06 - Transfer batter to prepared loaf pan. Use a spatula to spread evenly and smooth the top surface.
07 - Bake for 45-55 minutes until golden brown and a toothpick inserted into the center emerges clean. Begin checking at the 45-minute mark.
08 - Allow bread to cool in the pan for 10 minutes. Remove from pan and transfer to a wire rack to cool completely before slicing.