PREPARATION:
- Combine mayonnaise, garlic powder and 1/4 teaspoon black pepper in small bowl; set aside.
- Cut focaccia into quarters. Cut each quarter horizontally in half; set aside.
- Combine chicken, oil, garlic, basil, salt and remaining 1/4 teaspoon black pepper in large resealable food storage bag. Seal bag; knead to combine. Add bell pepper and zucchini; knead to coat.
- Grill or broil chicken, bell pepper and zucchini 4 inches from heat 6 to 8 minutes on each side or until chicken is no longer pink in center. (Bell pepper and zucchini may take less time.)
- Top bottom half of each focaccia quarter with mayonnaise mixture, tomatoes, bell pepper, zucchini and chicken. Top with focaccia tops.
