01 - Heat a dry skillet over medium heat and toast the pecans for 3 to 4 minutes, stirring frequently, until fragrant. Remove and let cool.
02 - In a large bowl, mix together the cooked chicken, celery, halved grapes, sliced green onions, and cooled pecans.
03 - In a separate small bowl, whisk the mayonnaise, Greek yogurt, Dijon mustard, lemon juice, salt, and black pepper until smooth.
04 - Pour the dressing over the chicken mixture and toss gently until all ingredients are evenly coated.
05 - Taste and adjust salt and pepper as desired.
06 - Serve chilled atop salad greens or lettuce leaves, or use as a filling for sandwiches or wraps.