Instructions: Spray skillet with cooking spray. Sautee mushrooms 5-6 minutes or until tender, turning occasionally. Onions can also be sauteed at this time if desired. Set aside. Set oven to broil. Toast 4 slices of the bread. Arrange bread on cookie sheet covered in foil. Spread bread with a thin layer of mayo. Next add the onions, sauteed or raw. Arrange the mushrooms on top of the onions. Add a tomato slice and a slice of cheese. Broil until cheese melts 1-2 minutes. Toast remaining 4 slices of bread. Top sandwich with lettuce. Add more mayo if desired to bread. Make 4 sandwiches.

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