INGREDIENTS
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Banana Batter
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2 1/4 cups all-purpose flour
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 stick unsalted butter, softened
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3/4 cup sugar
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2 large eggs
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1 1/4 cups mashed very ripe bananas (about 3 medium)
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2/3 cup plain whole-milk yogurt
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1 teaspoon pure vanilla extract
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Topping/filling
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1/4 cup sugar
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2 tablespoons unsalted butter, melted and cooled
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4 ounces 70%-cacao bittersweet chocolate, coarsely chopped
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1 cup walnuts (3 ounces), toasted , cooled, and coarsely chopped
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1/2 teaspoon cinnamon