I know it's sort of unexpected, but Pinterest actually has a lot of really good pins on kitchen witchcraft, as well as witchcraft in general. Pinterest was where I first heard of carving sigils into the bottom of pie crusts. But you could find recipes anywhere and it will still be kitchen witchcraft. Its the same with spells. I personally think that it would be better to make your own recipes or use a family recipe than to look one up, but not everyone wants to or has the knowledge to make their own recipes. When it comes down to it, it is a matter of preference and comfortability. Does it matter to you? If it does, then make your own. If it doesn't, then just do what feels right.