To make this Easy Oven Baked Chicken Breast Recipe gluten-free. You need to ensure that all ingredients used. Are certified gluten-free. Most of the ingredients in this recipe. Like the chicken breasts and spices. Are naturally gluten-free. However, some brands of seasonings. Particularly chili powder and cumin. Might contain traces of gluten. Due to cross-contamination during processing. To avoid this. Opt for spices labeled as gluten-free. Or purchase from a brand known for safe practices. Like McCormick or Simply Organic. Double-check the labels. Especially for the brown sugar. To ensure there are no gluten-containing additives. Once you have verified all your ingredients. Proceed with the recipe as instructed. For a delicious, gluten-free meal.