Recipes cannot be copyrighted, so there is no such thing as copyrighted recipe. If CC has a rule against posting "published" recipes (which I admit I am unaware of) that is their choice. The publishing of a recipe does not copyright it. Thus no one is violating copyright by posting a list of ingredients and the directions for how to combine them.
The ingredients from a particular recipe can be posted on the forums, the specific methodology cannot.
There is also a great scratch WASC recipe in the recipe section here on CC.
Hope this helps.