01 - Toast pecan halves in a dry skillet over medium heat for 3 to 4 minutes, stirring frequently until fragrant, then set aside to cool.
02 - In a large bowl, mix diced chicken, finely chopped celery, halved grapes, sliced green onions, and cooled toasted pecans.
03 - Whisk together mayonnaise, Greek yogurt or sour cream, Dijon mustard, fresh lemon juice, salt, and black pepper in a small bowl until smooth.
04 - Pour the dressing over the chicken mixture and toss gently to coat all ingredients evenly.
05 - Taste the salad and adjust salt and pepper seasoning as needed.
06 - Serve chilled over mixed salad greens or lettuce leaves, or use as a filling for sandwiches or wraps.