"Make and share this Foot-Long Croque Monsieur recipe from Food.com...."
INGREDIENTS
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1 1/4 cups milk
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2 tablespoons unsalted butter
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3 tablespoons flour
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2 tablespoons thyme
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1 loaf ciabatta (extra-long) or 1 loaf French bread (extra-long)
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3 tablespoons mustard
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3/4 lb deli ham
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2 cups grated gruyere cheese
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2 cups sharp cheddar cheese
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1 cup grated parmesan cheese