Top one piece of bread with cheese and the other with mustard.
Top the mustard with ham.
Put the two sandwich halves together and butter the outsides of the bread.
Lay sandwich flat in large skillet. Cook on medium low, covered. Adjust heat if sandwich is browning too quickly or slowly. You want the cheese to be melted when the bread is toasted. When first side is golden, flip so the uncooked side is down
Cover and continue cooking until cheese is almost melted. Remove cover to let bread crisp better and cook until cheese is melted and bread is golden.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.