INGREDIENTS
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1 cup all-purpose flour
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1 teaspoon coarse salt
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1/2 teaspoon poppy seeds, plus more for topping
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2 tablespoons cold unsalted butter, cut into small pieces
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1/2 cup finely grated sharp cheddar
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1/2 cup finely grated Gruyere
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1/4 cup whole milk
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1/4 teaspoon Dijon mustard