Spray skillet with cooking spray. Heat skillet over medium heat for 1 minute. Add onions and cook until they begin to soften. Add vinegar and cook 2 minutes or until most of the liquid has evaporated.
Top 2 slices bread with ham, cheese and onion mixture and remaining bread slices.
Spray skillet with cooking spray add sandwiches to pan cook until browned and cheese is melted.
By imaqt1962
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