INGREDIENTS
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2 tablespoons unsalted butter, softened
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4 cups fresh or thawed frozen blueberries, divided
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1/2 cup granulated sugar, divided
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1 tablespoon all-purpose flour
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1 teaspoon finely grated lemon zest
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1 tablespoon lemon juice
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1/4 teaspoon grated nutmeg
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1-1/4 cups all-purpose flour
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1/2 cup granulated sugar
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1-1/2 teaspoons baking powder
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1/4 teaspoon kosher salt
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1/2 teaspoon cinnamon
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4 tablespoons unsalted butter, melted
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1/2 cup whole milk
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1 teaspoon pure vanilla extract