To make this Garlic Roasted Potatoes and Veggies recipe fully gluten-free, ensure that the dry onion soup mix is certified gluten-free, as many standard brands include wheat-based ingredients or cross-contamination risks. All remaining ingredients—potatoes, vegetables, and olive oil—are naturally gluten-free. If preferred, you may replace the soup mix with a homemade blend of gluten-free spices such as garlic powder, onion powder, paprika, and salt.