1Spray grill rack with nonstick spray; prepare the grill for medium-hot cooking.
2Rub the chicken with the oil, then sprinkle with salt and pepper. Place the chicken on the grill rack and grill 4 minutes.
Turn the chicken and brush each breast half with 1//2 teaspoon of the mustard. Top each with 1 slice of the hame and 1 slice of the cheese. Cover the grill and grill until internal temperature is 170F, the ham is hot and cheese is melted, about 7 or 8 minutes longer.
3Suggestion: Serve with grilled veggies such as:yellow squash, zucchini, and asparagus. Grilled pineapple goes well too.