INGREDIENTS
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2¾ cups all-purpose flour
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2½ teaspoons baking powder
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½ teaspoon baking soda
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½ teaspoon salt
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1½ stick butter, softened
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1½ cups sugar
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3 large eggs
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1½ teaspoons vanilla extract
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1 cup sour cream
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½ cup mashed ripe banana
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Toffee topping:
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½ cup coarsely chopped chocolate-covered English toffee (such as Skor or Heath bar)
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¹/₃ cup all-purpose flour
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¼ cup powdered sugar
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2 tablespoons butter