Preheat oven to 350°.
Mash bananas in a large bowl.
Add almond milk, eggs, vanilla, and honey to the banana mixture and stir to combine well.
Add almond flour, flaxseed meal, rolled oats, cinnamon, nutmeg, and baking soda to the banana and egg mixture. Stir thoroughly to combine. The dough should be thick but still moist and pliable.
If adding walnuts and/or chocolate chips, fold them gently into the dough until they are evenly distributed.
Pour dough into a greased or parchment-lined loaf pan. Smooth the surface to ensure even baking.
Bake for 45-50 minutes or until golden brown and a cake tester comes out clean.
Remove to a cooling rack and let rest until cool enough to turn out into a pan or dish.