You won't even miss the mayonnaise in this classic chicken salad! I like to serve this on a bed of lettuce with a side of sliced tomato for a healthy lunch.
Combine sour cream, lemon juice, Dijon mustard, cream cheese, salt, pepper, and garlic powder in a bowl; whisk until smooth. Add chicken, celery, and red onion and mix thoroughly. Cover and refrigerate for 1 hour to let flavors blend.