INGREDIENTS
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5 tablespoons unsalted butter, plus extra at room temperature for greasing the pan
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1 tablespoon instant espresso powder
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1 1/2 cups all-purpose flour, spooned and leveled
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1 teaspoon baking soda
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1/4 teaspoon kosher salt
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4 medium-ripe bananas (the peel should be pretty black), peeled and halved
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1/2 cup granulated sugar
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2 tablespoons lightly-packed light brown sugar
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1 large egg, beaten
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3 ounces semisweet chocolate, finely chopped
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1 1/2 sticks (12 tablespoons) unsalted butter, at room temperature
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2 tablespoons confectioners' sugar
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1 teaspoon instant espresso powder
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Pinch of ground cinnamon
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Pinch of fine salt