Toast sesame seeds in a large skillet over medium heat 3 minutes or until lightly browned, shaking the pan frequently. Remove from pan.
Heat oil in pan over medium-high heat. Add zucchini; cook 3 minutes or until tender, stirring frequently. Add cabbage and next 4 ingredients (cabbage through pepper). Cover, reduce heat to medium, and cook 6 minutes or until tender, stirring occasionally. Remove from heat; stir in sesame seeds and mint, if desired. Serve immediately.