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 mashed bananas, eggs, melted butter, yogurt (or sour cream), and vanilla extract until smooth.
03 - In a separate bowl, whisk flour, granulated sugar, brown sugar, baking soda, salt, cinnamon, and nutmeg.
04 - Add dry ingredients to the wet mixture and gently fold together until just combined. Do not overmix.
05 - Fold in nuts or chocolate chips, if using.
06 - Pour batter into the prepared loaf pan and smooth the top.
07 - Bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
08 - Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.