1 (8 ounce) container fat-free plain yogurt
1/3 cup crumbled feta cheese with basil and sun-dried tomatoes
1/2 teaspoon lemon zest
2 tablespoons fresh lemon juice
2 teaspoons dried oregano
1/2 teaspoon salt
1/4 teaspoon ground black pepper
1/4 teaspoon crushed dried rosemary
1 pound skinless, boneless chicken breast halves - cut into 1 inch pieces
1 large red onion, cut into wedges
1 large green bell pepper, cut into 1 1/2 inch pieces