Preheat oven to 400 degrees and line a baking sheet with aluminum foil.
Toss chicken in a mixture of avocado oil (or olive oil) and salt, pepper, garlic, Italian seasoning
Bake chicken for 24-26 minutes, or until internal temperature reaches 165 degrees F
While chicken is baking, dice apples and red onion
Combine all salad ingredients together & enjoy
*If making into jar salads, layer (from bottom to top) - dressing, red onions, apples, chicken, feta, mixed greens, walnuts