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Preheat oven to 400 degrees F.
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Grate the cheese (you should have approximately 2 cups).
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Set aside.
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Place butter in bowl of mixer and beat until creamy.
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Add egg, salt, and pepper.
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Beat until blended.
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Beat in cheese one-third at a time until completely combined.
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Stir in flours and xanthan gum until thoroughly blended.
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Work the dough into a ball.
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If dough doesn't stick together, add cold water, 1 T at a time, until a ball can be formed.
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Don't worry about overworking.
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Divide dough in half.
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Place one half on a baking sheet, cover with plastic wrap, and roll out as thin as possible.
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Repeat with the other half.
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Sprinkle with salt, if desired, and cut with a pastry wheel into 1-inch squares.
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Bake for 4 to 6 minutes, until deep golden.