Preheat your Foreman Grill for 5-10 minutes on high with lid closed.
Assemble your sandwich but don’t put condiments or mayonnaise on.
Spread margarine on outside of both slices of bread and place sandwich on your George Foreman Grill. Press down lid with moderate pressure (not too hard) to press all ingredients nicely together.
Grill for approximately 4 minutes or until bread is nicely toasted and cheese is melted.
Remove from grill and spread inside of sandwich with mayonnaise.
Notes
Feel free to mix things up a bit with types of bread, cheese, condiments, etc.
A delicious additional ingredient is cooked bacon slices, which can be added prior to grilling the turkey melt sandwich.