INGREDIENTS
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3 tablespoons butter, cut into 6 equal-sized pieces
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1 cup whole milk
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3 eggs, beaten
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1/4 cup white sugar
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1 teaspoon vanilla extract
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1 cup all-purpose flour
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1/2 cup fresh blueberries
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1 tablespoon white sugar
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1 teaspoon ground cinnamon
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1/4 cup confectioners' sugar, or to taste
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1 lemon, halved