Using nonstick-coated aluminum foil for cooking or baking is generally safe, but it's important to follow the manufacturer's guidelines regarding temperature limits. Nonstick coatings are designed to withstand high temperatures, but excessive heat can cause them to break down or release harmful fumes. Always ensure the foil is placed in a way that the nonstick side does not come into direct contact with the heat source to prevent damage to the coating. Additionally, avoid using sharp or abrasive objects on the nonstick surface to maintain its integrity.