Ottolenghi Style: Chocolate, Banana And Pecan Cookies

Ingredients

• 8 tablespoons unsalted butter
• 1/2 cup plus 2 teaspoons granulated sugar
• 1 large egg
• 1 cup all-purpose flour
• 1/2 teaspoon baking powder
• 3 1/2 tablespoons Dutch-processed cocoa powder
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 3/4 cup dark chocolate chips, or 3 1/2 ounces dark chocolate
• 2 ounces mashed bananas (about 1/2 small banana)
• 1 1/3 cups pecan halves
• 3/4 cup plus 1 tablespoon confectioners' sugar