Preheat your oven to 350°F (175°C). Grease a 9×5-inch loaf pan or line it with parchment paper.

In a medium bowl, whisk together the flour, baking soda, salt, and cinnamon. Set aside.

In a large bowl, whisk the melted butter and brown sugar until glossy. Add the eggs one at a time, whisking well after each addition. Stir in the vanilla and yogurt if using.

Fold in the mashed bananas until evenly distributed.

Gently fold the dry ingredients into the wet mixture until just combined. Stir in nuts or chocolate chips if using.

Pour the batter into the prepared pan, smoothing the top. Bake for 55 to 65 minutes, rotating halfway.

Let the loaf cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.