Mediterranean Chopped Salad with Israeli Couscous

Name: Mediterranean Chopped Salad with Israeli Couscous
Ingredients: 2 large red or yellow bettes, roots and leaves trimmed; 4 tablespoons olive oil, divided; 1/2 cup Greek yogurt; 1-1/2 tablespoons fresh lemon juice; 1 teaspoon lemon zest; 1/4 teaspoon 1 pinch ground black pepper, divided; 1 red bell pepper, quartered; 1 yellow bell pepper, quartered; 1/2 small red onion, cut into 1/2-inch thick slices; 1/2 teaspoon kosher salt; 1/2 pound boneless, skinless chicken thighs or breasts; 2 teaspoons Middle Eastern seasoning mix**; 1/2 cup Israeli (pearl) couscous; 2 heads romaine lettuce, chopped; 1/3 cup crumbled feta cheese; 1/4 cup chopped fresh parsley