This recipe was clipped from a magazine and found in a large collection, date unknown. I’ve typed it below along with a scanned copy.
They bake in a well-seasoned cheese custard–
8 slices bread, crusts removed
Butter or margarine
2 cups ground cooked ham
2 tablespoons prepared mustard
2 cups grated process American cheese
3 slightly beaten eggs
2 cups milk
1/4 teaspoon salt
Spread both sides of bread with butter; cut on the diagonal. Put a slice of bread in each of 4 greased individual baking dishes. Mix ham and mustard; spread over bread; sprinkle with cheese. Cover with remaining bread slices. Combine eggs, milk, and seasonings; pour over. Chill 1 hour. Bake in slow oven (325°) 45 minutes, or until golden brown.