3-2-1 Salad (so named because it is 3 greens, 2 beans, and 1 topping)
Can of black beans, drained and rinsed
Can of chick peas/garbanzos, drained
Can of corn (whole kernel), drained
Red pepper chopped (optional)
Avocado, cubed
Balsamic vinegar 

Throw it all (except vinegar) in a big bowl with a lid and shake (or mix well). Serve, and let people put their own amount of vinegar on top.

(you can also do red onion; balsamic is optional)