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For the cake:: – 2 1/2 cups (317 grams) all-purpose flour – 1 1/2 teaspoons baking powder – 1 1/2 teaspoons ground cinnamon – 3/4 teaspoon baking soda – 1/2 teaspoon fine salt – 2 sticks unsalted butter (227 grams), at room temperature – 1 cup (200 grams) granulated sugar – 1/2 cup (100 grams) light brown sugar – 1 teaspoon vanilla extract – 2 large eggs, at room temperature – 1/2 cup (113 grams) sour cream – 1 1/3 cups (300 grams) mashed overripe bananas, from about 4 medium banana – 1 1/4 cups miniature chocolate chip For the frosting:: – 2 sticks unsalted butter (227 grams), at room temperature – 1 cup (270 grams) creamy peanut butter – 1 teaspoon vanilla extract – 1/8 teaspoon fine salt – 2 1/2 cups (313 grams) powdered sugar, sifted – Chocolate chips, for garnish, optional
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