Surprise Sandwiches - cooking recipe

Ingredients

12 slices bread
American cheese slices
prepared mustard
any of the following: ground ham, tuna, salmon, diced chicken or turkey
4 eggs, beaten
3 1/2 c. milk
1/2 tsp. salt
mushroom sauce (cream of mushroom soup diluted with cream or whole milk)

Preparation

Prepare the night before.
Grease an 8 x 10-inch pan with butter or oleo.
Place 6 slices of bread (crusts removed) in bottom of pan.
Cover each slice with a slice of American cheese. Then spread each with prepared mustard and cover with any of the listed meats.
Butter 6 more slices of bread and place on top, buttered side up.