Add a little olive oil to a saute pan over medium high heat.
Chop the chicken and and season with salt, pepper, and a tiny bit of garlic powder. Saute for just a few minutes, until cooked through.
In a large bowl toss together the chicken, celery, onion, grapes, apple, cranberries and almonds.
In a small bowl combine the Greek yogurt, mayo, and lemon juice and stir well to combine.
Add sauce to the large bowl with the chicken mixture and toss to evenly coat. Season with salt and pepper, to taste, if needed.
Wash lettuce and separate into leaves, patting them each dry with a paper towel.
Add a large spoonful of the chicken mixture to each lettuce wrap.