In a large mixing bowl, combine the old-fashioned rolled oats, ground flaxseed, chocolate protein powder, ground cinnamon, ground nutmeg, and kosher salt. Stir the dry ingredients together until they are well mixed.
In a separate bowl, mash the overripe bananas until smooth. Then, add the natural peanut butter and honey to the mashed bananas. Mix until everything is well combined and creamy.
Pour the wet ingredients into the bowl of dry ingredients. Using a rubber spatula, mix everything together until it forms a thick, sticky dough. If the mixture is too dry, you can add a splash of water or almond milk to help it come together. Once combined, use your hands to roll the mixture into small balls, about 1 inch in diameter. Place them on a parchment-lined cookie sheet.
Refrigerate the protein balls for at least 30 minutes to allow them to set. This will help them hold their shape when you bite into them. Once they are firm, you can enjoy them immediately or store them for later!
