To make this Greek Sheet-Pan Chicken gluten free, ensure that all packaged ingredients, especially the dried spices, feta cheese, and Kalamata olives, are certified gluten free and free from cross-contamination. The base recipe does not include flour or breaded ingredients, so it is naturally very close to gluten free as written. If serving the dish with sides, choose gluten-free options such as rice, roasted potatoes, or a simple salad instead of pita or other wheat-based breads.