"Plus an ingenious tip for not only making this cake ahead, but also making it even more moist a day later...."
INGREDIENTS
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1/4 pound (1 stick) unsalted butter, at room temperature
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3/4 cup granulated sugar
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1 extra-large egg, at room temperature
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1 teaspoon pure vanilla extract
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1 1/2 cups mashed bananas (3 to 4 very ripe bananas) (see Recipe Notes)
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1/4 cup sour cream
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1 1/2 cups all-purpose flour
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1 teaspoon baking powder
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3/4 teaspoon baking soda
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1/2 teaspoon kosher salt
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3/4 cup light brown sugar, lightly packed
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1/2 cup all-purpose flour
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1 1/2 teaspoons ground cinnamon
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1/4 teaspoon kosher salt
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4 tablespoons (1/2 stick) unsalted butter, at room temperature
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6 ounces bittersweet chocolate, chopped
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3 tablespoons sliced blanched almonds