Prepare the Creamy Dressing: In a small bowl, combine the mayonnaise (or Greek yogurt), fresh lime juice, and curry powder, if you're using it. Whisk these ingredients together until the dressing is smooth and creamy. Give it a quick taste and season with a pinch of salt and pepper. Set this bowl aside for a moment.

Combine the Main Ingredients: In a large mixing bowl, add your 2 cups of cooked and shredded or diced chicken. Next, add the diced mango. Add the finely chopped celery and the chopped red onion. Finally, add the fresh cilantro. If you're planning to add avocado, do not add it yet.

Dress and Mix the Salad: Pour your prepared creamy dressing over the chicken, mango, and vegetable mixture in the large bowl. Using a rubber spatula or a large spoon, gently fold everything together until everything is just combined and looks glossy.

Taste and Adjust Seasoning: Take a spoon and have a taste. Adjust the seasoning as needed with more salt, black pepper, or lime juice to achieve your perfect flavor profile.

Chill for Best Flavor (Recommended): Cover the bowl and let it chill in the refrigerator for at least 30 minutes. This allows the flavors to meld. If adding avocado, fold it in gently right after chilling, just before serving.