Another delicious recipe from Eating Well. If you have cooked or canned chicken on hand, you can substitute it for the tuna. I've also made this without pureeing, and just mixing it all together, still very good.
From Eating Well Magazine May/June 2011 - I deviated from the recipe slightly and it still turned out wonderfully. I used 1 cup green beans with 1 cup of mixed frozen bell peppers (added with the corn) and Queso Fresco instead of the Cotija