Preheat oven to 375°F and prepare a muffin pan by lining with liners or spraying with nonstick spray. Set aside.
In a large bowl, use a fork to mash the overripe bananas.
3 large bananas
Add oil, brown sugar, egg, and vanilla and stir until combined.
1/3 cup avocado oil, 1/3 cup light brown sugar, 1 large egg, 2 teaspoons vanilla bean paste or extract
Add dry ingredients (flour, cocoa powder, baking soda, baking powder, and salt) and stir just until combined.
1 cup white whole wheat flour, 1/2 cup unsweetened natural cocoa powder, 1 teaspoon baking soda, 1 teaspoon baking powder, 1/2 teaspoon kosher salt
Fold in chocolate chips.
3/4 cup semisweet chocolate chips
Divide batter into muffin cups, then place in the oven and bake for 23-25 minutes.
Remove from oven and let cool in the muffin pan for at least 5 minutes, or until cool enough to handle. Then transfer to a cooling rack to finish cooling.
Serve (or store in an airtight container) and enjoy!