Preheat oven to 350 F. Grease or line a 12-cup muffin tin.
In a large bowl, mash the banana (or add applesauce or pumpkin).
Whisk in eggs, milk, avocado oil, honey, and vanilla.
Add pancake mix, wheat bran, oats, protein powder, and cinnamon. Stir gently until combined.
Fold in dark chocolate chips.
Let batter rest for 5 minutes. If it’s too thick, add milk 1 tablespoon at a time. It should be thick but easy to scoop.
Divide among 12 muffin cups.
Bake for 14-16 minutes, until a toothpick inserted into the center comes out without wet batter.
Cool for 5 minutes before removing from the pan.