Preheat your oven to 400. Place your chicken in a baking dish, add a splash of olive oil and salt and pepper. Bake your chicken breast for 30 minutes or until cooked through. 

While it's cooking, dice your green onions and gala apple. Slice your red grapes in half. Set aside.

Once your chicken breast is fully cooked, shred it. Add to a large bowl. Add in your green onion, gala apple, grapes, greek yogurt, juice of one lemon and dijon mustard. Mix together. Add salt and pepper to taste. 

Let chill in refrigerator for one hour. Once chilled, add a few big spoonfuls to a lettuce cup and devour!