Cinnamon was my first choice when deciding what flavor to pair with this unique rollout cookie, roasted rhubarb gingerbread cookies. It turned out so well and also reminded me of cinnamon bun icing, mmmm.
You can generally add any flavoring extract to royal icing, and clear extracts are best if you want a simple white icing, but this time I wanted to actually see the cinnamon flecks. Use a clear cinnamon extract if you don’t want that look. The tiny ground cinnamon flecks don’t affect how the icing flows, but depending on the design of your cookie, it may not work artistically.
If you’re looking for my regular royal icing recipe or illustrated royal icing recipe, you can find it here. Add 1 teaspoon of ground cinnamon or 1 teaspoon of clear cinnamon extract to the regular recipe.