How to Make It
Preheat oven to 325°F. Line loaf pan or pans with parchment paper, and coat with cooking spray.
Whisk together flour, baking soda, and salt in a bowl.
Stir together butter, brown sugar, and granulated sugar with a wooden spoon in a separate bowl until thick and forms a paste. Add mashed bananas, eggs, sour cream, and vanilla to butter mixture, stirring until just combined.
Fold flour mixture into banana mixture. Once combined, fold in nuts and chocolate chips. Transfer batter to prepared loaf pans. Bake in preheated oven until a toothpick comes out mostly clean (will be moist but not raw), 45 to 55 minutes for 2 loaves, or 1 hour to 1 hour and 15 minutes for 1 loaf. Cool completely in pan.