I don't think one question fits all. Different writers would provoke different questions from me.

If you're looking for a template:
1. When did you start writing?
2. How often do you write?
3. why do you choose free verse/sonnets/tanka etc.?
4. what is your inspiration?
5. do you have any goals with your writing?
6. autobiographical?
7. favorite topics?
8. how does your overall philosophy of life influence your writing choices?
9. who/what has influenced you?

I could go on and on and ...