Preheat oven to 350°F and spray a 9x5-inch loaf pan with baking spray with flour. Line pan with parchment, leaving a few inches of overhang on the side so it will be easy to life the banana bread out of the pan once it's done.
In a large bowl, whisk together flour, both sugars, cinnamon, baking powder, and salt. Add oil, eggs, yogurt, and mashed banana. Mix on medium speed with an electric mixer until all ingredients are combined. Stir in 1 1/4 cups mini chocolate chips.
Pour batter into the prepared pan. Sprinkle remaining 1/4 cup chocolate chips over the top of the batter. Bake for 45 to 50 minutes, or until set in the center and a wooden pick inserted into the center comes out clean (a few crumbs are okay). Tent foil over pan if banana bread gets too brown around the edges. Let loaf cool in pan for 10 to 15 minutes, then transfer to a wire rack to cool completely.