Chicken Thigh & Sweet Potato Traybake / Laced with cumin and balsamic vinegar this chicken thigh fillet tray bake is a great one for convenience; also very good to use up any leftover vegetables. The bad news is this post is only for members - the GOOD news is it’s free to join! If you’re already a member login here; log in. Or sign up in less than a minute (and get free meal plans every week) here: Monthly Membership, Quarterly Membership, Annual Membership, Free Membership or Perks at Work.