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