Preheat oven to 350 degrees F.
Grease a muffin pan or line with baking cups.
In a large bowl, combine flour, protein powder, baking soda, salt, cinnamon, and oats.
In a separate bowl, mash bananas with a fork. Add oil, honey, eggs, and milk. Stir well.
Combine the dry ingredients with the wet. Then mix in chocolate chips and walnuts.
Fill muffin cups almost to the top, this recipe should make approximately 11 muffins.
Bake for about 20-25minutes or until a toothpick comes out clean.
Allow muffins to cool and enjoy!