INGREDIENTS
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1 medium acorn squash
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2 cups all-purpose flour
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1/4 cup firmly packed light brown sugar
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1/4 cup granulated sugar
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2 teaspoons baking powder
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3/4 teaspoon ground cinnamon
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1/2 teaspoon kosher salt
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8 tablespoons (1 stick) unsalted butter, frozen
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1/2 cup plus 1 tablespoon milk
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1 large egg yolk
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1 tablespoon sanding sugar, or granulated sugar