This is something my 11 year old daughter made after Thanksgiving; it is the best sandwich you will ever taste.
Place ham, turkey, and mashed potatoes on a microwave-safe plate and cook in the microwave until heated through, about 2 minutes.
Lay out two slices of bread; place 4 slices of ham on each slice of bread.
Lay out remaining two slices of bread; place 1 slice of turkey on each slice of bread. Spread 1/2 the potatoes on top of each turkey slice. Place turkey slice of bread together with ham slice of bread to form sandwiches.
Per Serving: 552 calories; protein 42.4g; carbohydrates 34.6g; fat 25.8g; cholesterol 107.7mg; sodium 1994.9mg.