"Originally from Southern Living; given to me by my lifelong best friend. Comfort food..."
INGREDIENTS
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3/4 cup shredded monterey jack cheese
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3/4 cup shredded sharp cheddar cheese
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3/4 cup shredded swiss cheese
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1/4 cup minced onion
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1/3 cup mayonnaise
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1 tablespoon Dijon mustard
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16 sandwich bread, slices
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1/2 cup butter or 1/2 cup margarine, softened
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1/2 lb thinly sliced ham (optional)