INGREDIENTS
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Streusel:
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1/4 cup granulated sugar
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1/3 cup light brown sugar, lightly packed
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1 teaspoon ground cinnamon
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1/8 teaspoon ground nutmeg
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1/4 pound (1 stick) unsalted butter, melted
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1 1/3 cups all-purpose flour
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Cake:
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6 tablespoons unsalted butter, at room temperature (3/4 stick)
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3/4 cup granulated sugar
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2 large eggs, at room temperature
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1 teaspoon pure vanilla extract
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1/2 teaspoon grated lemon zest
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2/3 cup crème fraiche
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1 1/4 cups 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 kosher salt
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1 cup fresh blueberries (optional)
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confectioners' sugar for sprinkling