Begin by chopping your cooked chicken into bite-sized pieces. Wash and halve the red grapes, dice the red onion, and chop the celery into small bits. Combine these in a large mixing bowl.

In a separate small bowl, whisk together the mayonnaise, lemon juice, salt, garlic powder, onion powder, and black pepper until smooth and creamy.

Pour the prepared dressing over the chicken and vegetable mixture, then gently stir until every piece is well-coated.

Once mixed, serve immediately or cover and refrigerate for about 30 minutes to meld the flavors. Serve in lettuce cups, on a buttery croissant, or as a refreshing side dish.