1 1/2 cups
(180g) unbleached all-purpose flour
1/2 cup
(43g) unsweetened cocoa (regular or Dutch-process)
3/4 cup
(140g) dark brown sugar
3/4 teaspoon
baking soda
3/4 teaspoon
sea salt or kosher salt
1/3 cup
(80ml) extra-virgin olive oil
2
large eggs, lightly beaten
1 1/2 cups
(350g) ultra ripe bananas (from about 3 large bananas), mashed with a fork into a smooth puree
1/4 cup
(60g) sour cream or plain Greek yogurt (full fat is best)
1 1/2 teaspoons
vanilla extract
1 cup
(113g) coarsely chopped dark chocolate (equals a 4-ounce bar), or an equal amount of dark chocolate chips
1/2 cup
(65g) chopped pecans or walnuts (optional)