Grilled Chicken Cordon Blue Sandwiches

From the Recipe Shoebox.

The ingredients:

4 boneless skinless chicken breasts (one per sandwich)
Salt and pepper to taste
1 Tbs. oil
4 slices deli ham (trimmed to fit over the chicken)
4 slices Swiss cheese (trimmed to fit over the chicken)
4 hamburger buns
Dijon mustard (we used honey-mustard instead)
Additional toppings as desired (lettuce, tomato, mayo, etc.)

Directions:  Trim fat from chicken and cut as necessary to fit buns.  We like to either use chicken tenderloins or cut each breast into 3 or 4 strips for easier grilling.  Season chicken with salt and pepper to taste.  Drizzle chicken with 1 tablespoon oil.  Sear chicken on grill 2 minutes until it has change color one-quarter of way up from bottom.  Turn over; sear 1-3 minutes.  Turn over chicken.  Cook 1-3 minutes; turn over again.  Reduce heat to MEDIUM: cook 12-15 minutes until internal temps reaches 165 degrees.  Brush about a tablespoon of honey-mustard onto each piece of chicken and top with a slice of ham and a slice of Swiss cheese.  Watching carefully, cook until the cheese is slightly melted.  Remove chicken from grill and transfer to a clean plate.  Meanwhile spread mustard onto the tops and bottoms of each bun and grill, mustard side down, until lightly toasted (about 1-2 minutes).  Place chicken/ham/cheese onto each bun and serve immediately with additional mustard, mayo, lettuce, and tomatoes (or whatever toppings you prefer).  Makes 4 sandwiches.  Enjoy!