Preheat the oven to 350 degrees F. Spray a 9x5-inch loaf pan with cooking spray. Set aside.
In a medium-sized bowl, whisk together the flour, baking powder, salt, and cocoa powder. Set this aside.
In another medium-sized bowl, mix the yogurt, honey, vanilla extract, egg, and milk until combined. In a couple of batches, add this to the dry ingredients. Stir until just combined.
Add the mashed bananas and stir until combined. Fold in 1 cup of chocolate chips.
Pour the batter into the prepared loaf pan and smooth the top. Top with more chocolate chips.
Bake for 60 minutes, or until a toothpick comes out clean when inserted into the center. Allow the bread to cool in the pan for 20 minutes before removing it to a wire rack to finish cooling.