Greek Chicken with cream

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 chopped cooked chicken breasts (about 12-13 ounces) 1 cup cucumber , peeled, seeded and diced small 1/3 cup feta cheese , crumbled (or more if desired)[...]