Greek Chicken and Pita Casserole

chopped cooked chicken or turkey

medium zucchini, halved lengthwise and cut into 1/2-inch pieces (4 cups)

10 3/4 - ounce can condensed cream of chicken soup

medium red onion, chopped (1/2 cup)

chicken broth

Greek seasoning

garlic, minced

6 - inches pita bread rounds, cut into bite-size wedges

Nonstick cooking spray

medium roma tomatoes, chopped (1 cup)

crumbled feta cheese (4 ounces)

pitted kalamata olives, sliced