In a 2-qt. microwave-safe bowl, combine froth, soy sauce, sugar, thyme, basil and onion powder. In a small bowl, combine water and cornstarch; stir until smooth. Add to the broth. Cover and microwave on high for 5 minutes or until broth comes to a boil. Add broccoli and carrot; cover and microwave on high for 3 minutes. Stir in lettuce; cover and let stand for 5 minutes.