1 teaspoon dried oregano
1/2 teaspoon garlic powder
3/4 teaspoon black pepper, divided
1/2 teaspoon salt, divided
Cooking spray
1 pound skinless, boneless chicken breast, cut into 1-inch cubes
5 teaspoons fresh lemon juice, divided
1 cup plain fat-free yogurt
2 teaspoons tahini (sesame-seed paste)
1 teaspoon bottled minced garlic
8 cups chopped romaine lettuce
1 cup peeled chopped English cucumber
1 cup grape tomatoes, halved
6 pitted kalamata olives, halved
1/4 cup (1 ounce) crumbled feta cheese