Chicken with feta

4 medium plum tomatoes , cut in 1/4-inch cubes 1/4 cup red onion , coarsely chopped 1/4 cup kalamata olive , pitted and sliced 2 tablespoons olive oil 3 -4[...]

3 cups diced cooked chicken 1 large celery , finely diced 1 red bell pepper , seeded and chopped 2 green onions , chopped (or use 1/3 cup chopped red onion,[...]