Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper, including up the sides, and spray with nonstick cooking spray.
In a large bowl, whisk together the flour, sugar, baking soda, and salt.
In a separate bowl, mash the bananas. Stir in sour cream, eggs, melted butter, oil, and vanilla.
To the banana mixture, add the flour mixture. Mix until well combined.
Fold in 1 cup of chocolate chips.
Pour the batter into the prepared loaf pan. Top with the remaining ½ cup of chocolate chips. Bake for 65-70 minutes, or until a toothpick inserted into the center comes out with a few crumbs but no wet batter.
Allow the bread to cool in the pan for about 20 minutes before lifting it out to cool completely. Slice and serve.