Recommended answer:
The recruiter wants to know whether you are capable of designing your own English teaching materials or not. Also, he/she wants to know how flexible you are in your teaching.
You should not deny the importance of a textbook but you should tell that in addition to the textbook you usually create your own supplementary materials - classroom activities, home assignments, quizzes, tests and examination papers. You should stress that you feel comfortable by using the textbook as well as your own materials.
You can also tell that a good textbook usually supports the objectives of the course and the teacher's task is to develop the skills to achieve these objectives. You will find more information about the importance of the textbook here...
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