1. In a medium bowl, combine chicken, mustard, paprika, garlic powder, chili powder, parsley, olive oil, Worcestershire sauce, and salt and pepper.
2. Heat two tablespoons oil or nonstick cooking spray in a grill pan or skillet. When the pan is sizzling hot, add chicken. Stir occasionally for seven to 10 minutes until chicken is cooked through. Remove from heat and set aside.