01 - Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper or grease thoroughly.
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 beaten. Add melted butter, almond milk, vanilla extract, and mashed bananas. Mix until smooth and uniform.
04 - Pour wet ingredients into dry ingredients. Stir gently until just combined, being careful not to overmix.
05 - Fold in chopped nuts or sugar-free chocolate chips if desired.
06 - Transfer batter to prepared loaf pan and smooth the top surface evenly.
07 - Bake for 45 to 55 minutes until a toothpick inserted into the center comes out clean and the top is golden brown.
08 - Let cool in the pan for 10 minutes, then remove and transfer to a wire rack to cool completely before slicing.