"This moist and flavorful lemon blueberry coffee cake combines the perfect balance of tangy citrus, sweet berries, and a crunchy streusel topping...."
INGREDIENTS
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1/2 cup granulated sugar
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1 cup all-purpose flour
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1/3 cup cold unsalted butter, cubed
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zest of 1 lemon
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2 1/2 cups all-purpose flour
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1 tablespoon cornstarch
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2 teaspoons baking powder
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 cup sour cream
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1/4 cup buttermilk
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1 cup granulated sugar
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1/2 cup unsalted butter, softened
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2 large eggs + 1 egg yolk
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2 teaspoons vanilla extract
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zest of 2 lemons
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1/4 cup lemon juice
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2 cups fresh or frozen blueberries
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2 cups powdered sugar
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2-3 tablespoons fresh lemon juice
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1/2 teaspoon vanilla extract