Combine all ingredients in a medium bowl. Taste and adjust seasoning if necessary.
Cover and refrigerate until you are ready to serve.
Serve chicken salad in pita bread, in lettuce wraps, or on crackers/toast.
Notes
Make ahead/storage: Make this in bulk and take it for lunch all week- stays good in the fridge for 3-5 days! Give it a stir to mix it up a bit before servings, since the yogurt will separate a bit.
For a dairy-free version, use mayo instead of yogurt, or a dairy free yogurt substitute.
To save time, use leftover tzatziki sauce or store-bought tzatiziki, by mixing about a cup of it with the chicken and seasoning to taste.