Prepare the Filling
In a mixing bowl, combine the shredded chicken, mayonnaise, Greek yogurt, red onion, celery, and lime juice. Stir well to blend all the ingredients. Season with salt and pepper according to taste.
Assemble the Avocado Boats
Spoon the chicken salad mixture into the avocado halves. Be generous with the filling, allowing it to mound slightly above the edges of the avocados.
Add Toppings
Top each filled avocado half with diced tomatoes and a sprinkle of chopped cilantro or parsley for freshness and color.
Serve
Serve immediately or chill in the refrigerator for about 30 minutes before serving if you prefer a cooler dish.
Tips:
To keep the avocados from browning, sprinkle the halves with additional lime juice before adding the filling.
For an extra kick, add a pinch of cayenne pepper or a few dashes of hot sauce to the chicken salad mixture.