To easily adapt our recipe for Cheesy Baked Chicken Breast and Peppers to be gluten-free. Just make sure a couple of ingredients are gluten-free friendly. First, confirm that your pickled peppers are clearly marked as gluten-free. As some brands might have additives or vinegars made from grains containing gluten. Also although cheese is naturally free of gluten. It's an idea to check that no gluten-based extras are included in pre-shredded cheese mixes. Choosing block cheese and shredding it yourself could be an option.