Preheat oven to 350F (175C) and prepare a 9x5x3" pan by greasing and flouring the sides and 1" up the bottom of the pan. shake out excess flour. Set aside.
Combine melted butter, canola oil, and sugars. Stir in 1 ½ cups mashed bananas
¼ cup unsalted butter, ¼ cup canola or vegetable oil, ½ cup brown sugar, ½ cup sugar, 1 ½ cups mashed bananas
Stir in eggs and vanilla extract.
2 large eggs, 1 Tablespoon vanilla extract
In a separate, medium-sized bowl, combine flour, baking powder, baking soda, and salt, and stir until well-combined
2 cups all-purpose flour, 1 ½ teaspoons baking powder, ½ teaspoons baking soda, ¾ teaspoon salt
Gradually add the dry ingredients to the wet until just combined -- do not over-mix. A few streaks of flour remaining in the batter is OK.
Gently fold in chocolate chips.
1 cup semisweet chocolate chips
Pour batter evenly into prepared baking pan and sprinkle generously with sugar (if desired).
Coarse sugar for sprinkling
Bake in 350F (175C) oven for 65-75 minutes or until a toothpick inserted in the center comes out clean/without wet batter.
Allow to cool for 10 minutes before running a knife around the inside of the pan and inverting onto a cooling rack to cool before slicing and serving.