Gluten-free muffin mix Our muffin mix features a hint of vanilla, a touch of nutmeg - and it's 100% gluten free! Makes a dozen light, tender, high-rising muffins. added blueberries to the muffins for a spectacular breakfast treat. The results were amazing. They were so moist and delicious.H.P., Shelburne, Vermont King Arthur Flour is proud to introduce the very best gluten-free muffin mix youl ever bake. Certified Gluten-Freeby the non-profit Gluten-Free Certification Organization (GFCO), a program of the Gluten Intolerance Group (GIG).