Prepare Your Pan and Oven: Begin by preheating your oven to 325°F (165°C). Grease a 9×5-inch loaf pan lightly with butter or oil, then line it with parchment paper, allowing some overhang to help with easy bread removal later.
Combine Dry Ingredients: In a medium bowl, sift together the flour, baking soda, and salt. Set this mixture aside for now, as it will be gently folded into the wet ingredients later.
Mix Sugars and Butter Thoroughly: In a larger bowl, whisk the melted butter with both the brown and granulated sugars until it forms a smooth, thick paste. This process might take a couple of minutes and can be done by hand with a whisk or using an electric mixer fitted with a paddle attachment.
Add Bananas and Flavorings: Stir in the mashed bananas into the butter-sugar mixture, followed by the eggs, Greek yogurt, and vanilla extract. Mix just until combined, making sure all ingredients are evenly incorporated.
Incorporate Dry Ingredients: Using a spatula, fold the flour mixture into the wet ingredients gently, taking care not to overmix. The batter should be thick but moist.
Fold in Chocolate Chips: Add the mini chocolate chips and fold them in evenly throughout the batter. Reserve a small handful of chips for sprinkling on top before baking.
Transfer Batter and Bake: Pour the batter into your prepared loaf pan, smoothing the top with a spatula. Sprinkle the remaining chocolate chips evenly over the surface.
Bake and Test for Doneness: Bake in the preheated oven for 60 to 75 minutes, or until a toothpick inserted into the center comes out with just a few moist crumbs attached—not wet batter. Remove from the oven and let cool completely in the pan on a wire rack before slicing.