Heat oven to 400°F. Place chicken strips on ungreased cookie sheet. Bake at 400°F. for 18 minutes or until chicken is thoroughly heated.
Meanwhile, spread margarine on bread slices. Add bread to cookie sheet with chicken during last 10 minutes of cooking time.
Spread dressing on each toasted bread slice. Top with chicken, half cheese slice, ham and another half cheese slice. Bake an additional 2 to 3 minutes or until cheese is melted.