"The incomparable flavor of pure maple syrup is reason enough to make this sweet treat; that it is also quick to prepare is an added bonus. Maple syrup is marked and graded by its color, ranging from light to dark -- the darker the color, the more intense the flavor. If you can find grade B, use it here for both the batter and the icing...."
INGREDIENTS
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1 cup (2 sticks) unsalted butter, room temperature, plus more for pan
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2 1/2 cups all-purpose flour, plus more for pan
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon coarse salt
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3/4 cup pure maple syrup
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1/2 cup granulated sugar
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2 large eggs
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1 teaspoon vanilla extract
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3/4 cup sour cream
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1/3 cup pure maple syrup, plus more if needed
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3 tablespoons unsalted butter, melted
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2 1/2 cups confectioners' sugar, plus more if needed