"Adapted from King Arthur..."
INGREDIENTS
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1 cup (2 sticks) butter
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1 1/4 cups sugar
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1/2 teaspoon salt
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4 eggs
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2 teaspoons baking powder
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1 cup milk
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3 cups whole-wheat flour (I used whole-wheat pastry flour)
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1 1/2 cups (8 ounce bag) frozen blueberries (I used Cascadian Farm brand)
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2 - 2 1/2 teaspoons lemon zest (a microplane is the best tool for this)
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1/2 cup heavy cream (for the topping)