Pour cooking oil into a wok or large skillet. (Add more oil as necessary during cooking.) Preheat over medium-high heat. Stir-fry zucchini and yellow squash in hot oil for 3 to 4 minutes or until crisp-tender. Remove vegetables from the wok.
Add broccoli, basil, oregano, salt, and pepper to the hot wok. Stir-fry for 2 to 3 minutes or until crisp-tender.
Return cooked zucchini and yellow squash to the wok. Add tomato and butter or margarine. Stir-fry just until butter is melted. Serve immediately. Makes 4 to 6 servings.