Start by preheating your oven to 375 F.
Next, prepare your oat flour by making your own (see notes). If you are using pre-made oat flour, you can skip this step.
Add all of your dry ingredients to a bowl and mix to combine.
In another large bowl, add the bananas and mash them well. Then, add in the avocado oil, apple cider vinegar, almond milk, and vanilla, and mix until fully it's fully incorproated.
Then, add the dry ingredients to the wet and mix until just combined. Be careful not to over mix, as your muffins will get tough. Then, fold in the chocolate chips.
Pour the batter into the muffin cavities, being sure to divide the batter evenly - you should end up with 20-24 muffins.
Bake for 18-22 minutes or until a toothpick comes out clean.
Remove them from the oven and let cool. Use a knife to scrape around the side of each muffin tin to remove them, if necessary.
Once cool, serve and enjoy! You can also store these muffins in an airtight container for up to one week.