Ok, I made this for dinner tonight as it is kind of an old standby that I had forgotten all about. Instead of 1 cup of mayo, I used 1/2 c. olive oil mayo and 1 c. greek yogurt (sour cream would work too). I really couldn't tell the difference in the flavor of the sauce, and it had waaaaaaaaaaaaaaaay fewer calories and more protein than had it been the full cup of mayo.
Delish! Made with 6 chicken breasts instead of 4. Also added a bag of frozen cauliflower too. Used Greek yogurt for the sour cream....then ended up adding about a 1/4 cup of sour cream since I upped the chicken and the veggies. So yummy.