Preheat oven to 375 degrees F. Line a regular muffin pan with paper liners or grease with non-stick spray.

In a large bowl, combine flour, sugar, baking soda, baking powder and salt.

In a separate bowl, whisk together the olive oil, buttermilk, maple syrup, mashed bananas, and vanilla extract.

Add the wet ingredients to the flour mixture and mix just until combined and until no streaks of flour remain. Do not overmix. Stir in chocolate chunks.

Scoop into prepared muffin pan, filling approximately 3/4 way full. Sprinkle with sparkling/coarse sugar, if desired.

Bake until edges just begin to brown and center springs back when gently pressed, about 20 minutes.

Let cool in the pan until cool enough to handle, then transfer to a wire rack to cool completely.