Preheat your oven to 350ºF (175ºC) and grease a 9 x 5 inch loaf pan.

Combine 1 cup mashed overripe bananas with 1/2 cup melted unsalted butter until smoothly mixed.

Mix in 3/4 cup granulated sugar and 1/4 cup brown sugar, then add 2 eggs, 1 teaspoon vanilla extract, and 1/2 cup Greek yogurt, blending until smooth.

In a separate bowl, whisk together 1 1/2 cups all-purpose flour, 3/4 teaspoon baking soda, and 1 teaspoon salt. Fold this dry mixture into the wet mixture until just combined.

Add 2/3 cup chocolate chips, gently folding them into the batter without over-mixing.

Pour the batter into the prepared loaf pan and bake for about 50 minutes, or until a toothpick comes out clean.

Let the loaf cool in the pan for 15 minutes before transferring it to a wire rack to cool completely.