INGREDIENTS
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1/2 cup milk
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1 stick (4 ounces/113 grams) unsalted butter, cut into pieces
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1 tablespoon sugar
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1 teaspoon salt
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1 cup (120 grams) all-purpose flour
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3 to 4 large eggs, at room temperature
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1 cup grated Cheddar cheese
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1/2 cup grated Gruyere cheese