1. 1. Heat oil in a large pan over medium heat.

2. 2. Add chopped fresh onion and sauté until translucent.

3. 3. Add sliced button mushrooms and cook until they start to brown.

4. 4. Add sliced zucchini and cherry tomatoes to the pan and stir well.

5. 5. Season with salt, pepper, and any desired spices (e.g. garlic powder, paprika).

6. 6. Cook for another 5-7 minutes or until the vegetables are tender but still crisp.

7. 7. Serve hot as a side dish or over rice or noodles.