To make these Cinnamon Roasted Almonds gluten-free, confirm that the almonds, vanilla extract, white sugar, light brown sugar, salt, and ground cinnamon are labeled gluten-free. Some spices, flavored extracts, and packaged nuts may be processed on shared equipment, so check labels for cross-contact warnings. Use clean mixing bowls, baking pans, parchment paper, measuring tools, and storage containers to prevent gluten contamination.