INGREDIENTS
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4 large eggs, at room temperature
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2 tablespoons light sour cream
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1 tablespoon dark rum
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1 1/2 cups all-purpose flour
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3/4 teaspoon baking powder
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1/2 teaspoon ground cinnamon
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3/4 teaspoon salt
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2 sticks (1/2 lb.) unsalted butter
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3/4 cup firmly packed dark brown sugar
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1/4 cup sugar
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1 large ripe banana, mashed
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4 ounces semisweet chocolate, coarsely chopped
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1/2 cup chocolate-hazelnut spread
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2 tablespoons light sour cream
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1/3 cup chopped banana chips