"Moist, blueberry coffeecake with cinnamon streusel...."
INGREDIENTS
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1/3 cup (67g) sugar
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1/2 cup (57g) King Arthur Unbleached All-Purpose Flour
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1 teaspoon cinnamon
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1/8 teaspoon salt
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4 tablespoons (57g) butter at room temperature at least 65°F
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2 cups (241g) King Arthur Unbleached All-Purpose Flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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3/4 cup (149g) sugar
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4 tablespoons (57g) butter softened
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1 large egg at room temperature
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1 teaspoon vanilla extract
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1/2 cup (113g) milk at room temperature
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2 cups (283g) fresh or frozen blueberries