To make this Grilled Chicken Tikka Masala Recipe gluten-free, confirm that the plain yogurt, tomato sauce, heavy cream, butter, garam masala, paprika, cumin, cinnamon, cayenne pepper, black pepper, salt, and all packaged spices are labeled gluten-free. Some spice blends and tomato sauces may contain gluten-based additives or cross-contact warnings, so check labels carefully. Serve with certified gluten-free naan or gluten-free rice instead of regular garlic naan. Use clean skewers, bowls, utensils, grill grates, and cookware to prevent gluten contamination.