Heat oil in a large nonstick skillet over medium-high heat until hot. Add onion and garlic; cook, stirring constantly, 2 to 3 minutes or until tender.
Add zucchini. Cook 6 to 7 minutes or until zucchini is lightly browned and tender.
Stir in corn and remaining 3 ingredients. Cook 6 to 8 minutes, stirring occasionally.