Yes, you can. You can roast the halloumi if you prefer but it will take longer. If you want to make this whole dish roasted then check out my u003ca href=u0022https://www.thelastfoodblog.com/vegetable-fajitas/u0022u003eRoasted Vegetable Fajitasu003c/au003e. You can add the halloumi to those if you like.