I meet tons of great, new and seasoned UX Designers on a daily basis and one common question I get is "What questions do you think I’ll be asked in an interview?".

It's highly recommended to prepare your best work and when talking through your design process, you can either start with your approach on an existing project or even highlight a challenging one in the past that you are most proud of!

I always encourage my candidates to talk about a project that makes them excited, that way you will be more comfortable and can display a strong thought process. 

Most importantly, research the company and person you are interviewing with so you are not discussing something totally off topic.