Step 1

Preheat the oven to 350 degrees F. Butter a 9-by-5-inch loaf pan.

Step 2

In a medium bowl, whisk together the flour, salt, baking soda, cinnamon and nutmeg until well combined.

Step 3

Place the butter and sugar in the bowl of a stand mixer fitted with a paddle attachment and cream together until fully combined. Add the bananas and mix for about a minute to smash the bananas thoroughly. Add the sour cream, eggs and vanilla and, you guessed it, mix. Finally, add the flour mixture and mix until just combined. Tip: Do not overmix the batter, as it can make the crumb tough and result in large "worm" holes.

Step 4

Melt the chopped chocolate over a double boiler or microwave it in a glass or plastic bowl in 30-second intervals, stirring between intervals so the chocolate does not burn. Allow the chocolate to cool slightly. In a medium bowl, mix 1 cup of the batter with the chocolate until well combined.

Step 5

Pour the banana batter into the prepared pan. Pour the chocolate batter in the center of the batter and swirl throughout the batter with a spoon to create the marbling effect. Bake until a toothpick inserted in the center of the loaf comes out clean, 50 to 55 minutes (okay, maybe one crumb. Or two).

Step 6

Allow the loaf to cool in the pan for 5 minutes, then transfer it from the pan to a cooling rack to continue cooling to room temperature, and you're done! Slice, sprinkle with flaked sea salt and a touch of chili powder. Boom. Banana chocolate deliciousness.