Step 1

Preheat the oven to 350 degrees F, and mist a 5-cup loaf pan with non-stick spray.

Step 2

Place the flour, sugar, cocoa powder, baking soda, and salt in a large bowl and whisk to combine.

Step 3

Mash the bananas in a smaller bowl, and stir together with the sour cream, milk, eggs, melted butter, and vanilla.

Step 4

Add the banana mixture to the dry ingredients in the larger bowl, and fold together just until combined.

Step 5

Pour the batter into the prepared loaf pan, sprinkle the chocolate chips on top, and bake until the loaf springs back when gently pressed and a skewer inserted in the thickest part comes out clean or with a few moist crumbs (approx. 1 hour to 1 hour 15 minutes).

Step 6

Cool for about 20 minutes in the pan, then remove it to a wire rack to cool completely before slicing.