To make sure that your Mackinac Island Fudge is enjoyable, for everyone, those with sensitivities here's a simple yet effective tip; pay attention to the surface you use for cooling and shaping the fudge. While the main ingredients of this recipe are naturally free from gluten (like butter, sugars, cocoa and vanilla) it's important to prevent cross-contamination during the cooling process. For a version of this recipe use a clean surface, like a silicone mat or parchment paper when pouring and shaping the fudge. Additionally ensure that all your ingredients, vanilla extract and cocoa powder are certified as gluten-free to avoid any traces of gluten.