Preheat oven to 350°F (177°C). Grease a 9×5-inch loaf pan and set aside.
In a large bowl, whisk flour, cocoa powder, baking soda, and salt until combined. Stir in ¾ cup chocolate chips.
In a separate bowl, beat butter and sugar until light and creamy, about 3 minutes.
Add eggs one at a time, mixing well after each addition.
Beat in yogurt, mashed bananas, and vanilla extract until combined.
Add dry ingredients and hot water. Mix on low speed just until combined. Do not overmix.
Pour batter into prepared pan and sprinkle remaining chocolate chips down the center.
Bake for 60–65 minutes, loosely covering with foil halfway through to prevent over-browning.
The bread is done when a toothpick inserted in the center comes out with a few moist crumbs.
Cool in the pan on a wire rack for 1–2 hours before slicing.