This Sausage, Peppers and Onions Recipe can be made gluten free by using certified gluten-free Italian sausages and confirming that the crushed tomatoes, Italian seasoning, and minced garlic contain no gluten-based additives. If serving the dish with bread or rolls, choose a certified gluten-free option. Always check labels carefully if preparing the recipe for someone with celiac disease or a strict gluten-free diet.