I've made this a couple times! I recommend using real chopped onion instead of onion flakes. I used the flakes the first time and I couldn't taste them at all. The salad was much more flavorful the second time I made it with the diced onion. I also added extra garlic powder the second time. For the mayo, Kraft's reduced fat mayo with olive oil was perfect. I make this recipe with greek yogurt (not sour cream), and so far I've used both almonds and sunflower seeds.
I really liked the pineapple in this recipe. I have never put fruit in my chicken salad but I will definitely make this one again. I did add a little more celery salt to add more flavor