Rich Chocolate Espresso Banana Bread with a Delightful Twist

Ingredients

• 1 cup all-purpose flour
• ¼ cup cocoa powder
• 1 teaspoon baking soda
• ½ teaspoon kosher salt
• ½ teaspoon espresso powder
• ½ cup olive oil
• ½ cup brown sugar
• ½ cup granulated sugar
• 2 eggs, room temperature
• 1 teaspoon vanilla extract
• ½ cup sour cream
• 1 cup ripe bananas, mashed
• ½ cup dark chocolate chips, plus a few for topping
• ½ cup semi-sweet chocolate chips, plus a few for topping
• 1 tablespoon all-purpose flour, for dusting chocolate chips
• ¼ banana, sliced lengthwise into 2 thin slices
• 1 teaspoon granulated sugar