Cook the chicken breasts as desired (Crock-pot, Instant-pot, boil, or bake) and shred into large chunks. Place in a large glass bowl and set aside.
While chicken is cooking, finely chop the celery and red onion.
In a smaller bowl mix the Greek yogurt, mayo, dill, salt, pepper, and garlic together.
Add the chopped celery and red onion to the large bowl with the chicken. Pour dressing over chicken and vegetables. Stir well to evenly combine all of the ingredients.
Serve in a bowl with crackers or as a sandwich and enjoy.
Store prepared chicken salad in an airtight container in the fridge for up to 5 days. Do not freeze.
Notes
*The nutritional information is for the prepared chicken salad as written only and does not include crackers, bread, or additional mix-ins.