INGREDIENTS
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3/4 cup (1 1/2 sticks) unsalted butter, room temperature, plus more for pan
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2 cups all-purpose flour
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2 teaspoons baking powder
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3/4 teaspoon salt
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1/2 teaspoon baking soda
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1 1/4 cups sugar
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3 large eggs
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3 cups mashed medium very ripe bananas (about 6)
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1 cup chopped toasted walnuts or chocolate chips (optional)