Skewers: Preheat broiler to 500 F. Line broiler pan with foil and spray with nonstick spray. Thread cubed chicken and ham pieces onto skewers. In small bowl, mix Dijon, syrup, pepper, paprika & oil.
Brush mustard mixture on skewers. Broil about 5 minutes, flip and cook 5 minutes, until chicken is cooked through.
Sauce: Over medium heat, melt butter. Whisk in flour and cook 1 minute, whisking constantly. Gradually add milk, whisking constantly. Add Dijon. Cook 5 minutes, or until thick. Reduce heat to low and stir in cheese, whisking until melted.
Add salt and pepper, to taste, if desired. Serve chicken and ham kebabs with sauce.