01 - Preheat the oven to 350°F. Grease and flour a 9x5-inch loaf pan or line with parchment paper.
02 - In a large bowl, whisk together the mashed bananas, eggs, melted butter, Greek yogurt or sour cream, and vanilla extract until smooth.
03 - In a separate bowl, combine the flour, sugar, baking soda, salt, and cinnamon if using.
04 - Add the dry ingredients to the wet mixture and stir gently until just combined. Do not overmix.
05 - Fold in the chocolate chips, reserving a few to sprinkle on top if desired.
06 - Pour the batter into the prepared loaf pan and smooth the top. Sprinkle reserved chocolate chips over the batter.
07 - Bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
08 - Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.