Kosher or coarse salt and freshly ground pepperto taste
Make the Lettuce: Pile the lettuce in a large shallow serving bowl. Arrange the tomatoes, pepper, onion, feta, chicken, and cucumber on top of the lettuce.
Make the Dressing: In a small container combine the olive oil, lemon juice, rice vinegar, Dijon and thyme. Season with salt and pepper, and shake to combine. Pour the dressing over the salad, toss and serve.