Season that Chicken: Salt and pepper, both sides.
Cook the Chicken: Olive oil in a pan, medium heat, 5 minutes each side. Let it cool, then shred it.
Dressing Time: Big bowl, mix Greek yogurt, lemon juice, oregano.
Throw in the Good Stuff: Celery, apple, almonds, grapes, dill, salt, and pepper.
Chicken Time: Mix in the chicken.
Chill: Stick the Greek Yogurt Chicken Salad in the fridge. Wait an hour, if you can!