^
Chicken is not fattening, cheese, croutons, nuts, seeds in reasonable quantities are not a problem either. The issue here is moderation.
Salad should never taste like "rabbit food", but unfortunately, many restaurants don't know how to prepare a proper salad and they serve some really horrible concoctions. And in many places, veggies have no taste - everybody who tasted a home-grown tomato knows what I'm talking about.
OP: a classic vinaigrette is the most non-fattening option. Just don't add sugar to it - a touch of honey is fine. Yoghurt based dressings are also fine, always use full-fat Greek (style), unsweetened yoghurt.
Also, if you want to "perk up" the taste of your salads, use small quantities of strongly tasting ingredients - aged cheese, smoked nuts, toasted sesame seeds, sundried tomatoes etc.
_________________
"Facts do not cease to exist because they are ignored." Aldous Huxley