Preheat the oven to 425˚F. Put mashed bananas, canola oil, eggs, and melted butter in a bowl and whisk to combine.
In a separate bowl, combine flour, granulated sugar, baking soda, baking powder, and salt. Add to the wet ingredients. Stir to combine.
Fold in the semi-sweet chocolate chips.
Fill 12 lined muffin tin cups. Sprinkle with coarse sugar.
Bake at 425˚F for 5 minutes. Then, leaving the pan in the oven, turn it down to 350˚F and continue baking the muffins for 15-18 minutes or until a toothpick inserted in the center comes out clean.
Cool in pan for 5 minutes.
Remove from pan and cool completely on wire rack.
Video
Notes
Store muffins in an airtight container at room temperature for 1-2 days, in the fridge for up to a week, or in the freezer for 2-3 months.