1. In 2-quart microwave-safe casserole, combine broccoli and cauliflower. Cover with lid; microwave on high 8 minutes or until vegetables are thawed, stirring once during cooking. Drain. Cut broccoli into bite-size pieces.
2. In small bowl, stir soup until smooth; stir in milk. Pour over vegetables. Cover; microwave on high 8 minutes or until hot and bubbling, stirring twice during cooking. Let stand, covered, 3 minutes. Sprinkle with croutons.