Preheat your oven to 375°F and line a muffin tin with muffin liners.
In a large bowl, mash the spotty banana, then add Greek yogurt, coconut sugar, milk, eggs, vanilla, and melted coconut oil. Whisk until well combined.
Add the all-purpose flour, baking soda, baking powder, and salt to the bowl. Use a spatula to mix until just combined.
Fold in the mini chocolate chips, then use a double cookie scoop to fill the muffin liners with batter. Sprinkle more chocolate chips on top if desired.
Bake for 21-23 minutes, or until a toothpick inserted in the center comes out clean.
Allow the muffins to cool for 10 minutes before enjoying your freshly baked treats!