Preheat oven to 350F and grease muffin tin or line with muffin liners.
In a medium sized bowl, whisk together flour, baking soda, baking powder, salt, and cinnamon.
In a large bowl, mash two ripe bananas. Whisk in avocado oil and maple syrup, then whisk in greek yogurt, egg, and milk.
Continue to whisk and add peanut butter and vanilla.
Add dry ingredients to wet and stir until just combined, do not over mix. Fold in 1.5 cups of mini chocolate chips.
Fill muffin tins with batter 2/3 of the way - you will fill about 18 muffins. Sprinkle remaining chocolate chips on top.
Bake for 15-17 minutes or until toothpick inserted comes out clean. Let cool for at least 10 minutes before eating.