INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter at room temperature
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1 1/2 cups granulated sugar
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3 extra-large eggs at room temperature (i used large and it came out just fine)
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1 1/2 teaspoons pure vanilla extract
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1 1/4 cups sour cream
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2 1/2 cups cake flour
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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For the streusel:
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1/4 cup light brown sugar, packed
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1/2 cup all-purpose flour
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1 1/2 teaspoons ground cinnamon
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1/4 teaspoon kosher salt
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3 tablespoons cold unsalted butter, cut into pieces
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3/4 cup chopped walnuts, optional
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For the glaze:
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1/2 cup confectioners' sugar
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2 tablespoons real maple syrup