Mix Wet Ingredients: Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan and line with parchment paper leaving some overhang for easy removal. In a large mixing bowl, whisk the bananas, melted butter, brown sugar, eggs, Greek yogurt, and vanilla until fully combined.
1/2 cup (1 stick) unsalted butter, melted, 1 cup (200 g) packed light brown sugar, 1 1/2 cups (345 g) mashed ripe banana, 2 large eggs, 2 teaspoons vanilla extract, 1/2 cup (120 g) plain Greek yogurt
Add Dry Ingredients: Add the flour, baking soda, cinnamon, and salt on top of the wet mixture. With a fork, gently whisk the dry ingredients on top of the wet without combining them. Finally fold them into the wet until just combined. Fold in the chocolate chunks.
1 1/2 teaspoons ground cinnamon, 1 1/2 cups (195 g) all purpose flour, 1 teaspoon baking soda, 1/2 teaspoon kosher salt, 1 cup (6 ounces; 170 g) chopped chocolate or chocolate chunks
Transfer: Pour the batter in the prepared loaf pan. Sprinkle coarse sugar or more chocolate on top if desired.
Bake & Cool: Bake for 55–65 minutes, or until a toothpick inserted into the center comes out clean. Loosely cover the pan with aluminum foil halfway through. Cool in the pan for 15 minutes, then transfer to a wire rack to cool completely before slicing.