INGREDIENTS
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½ cup mini bittersweet chocolate chips
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1 1/8 cups all purpose flour
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1½ teaspoons baking powder
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1½ teaspoons baking soda
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1/8 teaspoon salt
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¼ cup sour cream
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¼ cup mascarpone cheese, warmed to room temperature
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6 tablespoons (¾ stick) unsalted butter, warmed to room temperature
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¼ teaspoon cinnamon; ground
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½ cup granulated sugar
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1 large whole egg, warmed to room temperature
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1 large (½ cup) banana, ripe, pureed
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Sifter
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Four mixing bowls
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Stand mixer fitted with the paddle attachment or hand mixer