Preheat your oven to 375 degrees F. Grease bread loaf pan. Set aside.
In a large bowl, add the peeled bananas and using the back of a fork, mash them well. No large chunks should remain. Add in brown sugar, cane sugar, dairy free milk, oil, apple cider vinegar, and vanilla. Stir together well with a silicone spatula.
Sift in the flour, baking powder, baking soda, salt and if adding the cinnamon and nutmeg. Stir again just until combined.
Gently fold in walnut pieces if you are adding.
Pour into greased bread pan and tap the bottom of the pan to ensure it's evenly leveled.
Bake for 35-45 minutes. When done, a toothpick inserted when come out clean.
*The top of the bread should be a deep brown color. If after 45 minutes, your bread needs more time, cover the top with foil and continue cooking in 5 minute intervals until the toothpick comes out clean.
Remove from oven and let cool for 15 minutes in pan. Then carefully remove and place on a cooling rack until completely cooled.