INGREDIENTS
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1 cup (8 ounces) water
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8 tablespoons (4 ounces/1 stick) unsalted butter, cut into several pieces
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1/2 teaspoon salt
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1/2 teaspoon dry mustard powder (optional)
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1 cup (5 ounces) all-purpose flour
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4 large eggs, lightly beaten
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1 1/2 cup (6 ounces) grated cheese, like gruyère or cheddar