"A classic cinnamon streusel coffee cake, rich with sour cream...."
INGREDIENTS
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8 tablespoons (113g) unsalted butter softened
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1 cup (198g) granulated sugar
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2 large eggs at room temperature
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2 cups (240g) King Arthur Unbleached All-Purpose Flour
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1 teaspoon baking powder
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1/4 teaspoon baking soda
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1/2 teaspoon salt
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1 cup (227g) sour cream or plain yogurt at room temperature
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1/2 cup (99g) granulated sugar
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2 teaspoons cinnamon
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2 teaspoons King Arthur Pure Vanilla Extract
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1/2 cup (57g) chopped walnuts or pecans optional