If you go out on the web and search for impossible pie recipes you'll find a bunch of them. I don't use bisquick but plain old flour and it comes out the same to me. I've been making the coconut custard version for years. I tried the recipe without the flour to see what would happen as I had company that was glutten free. The flour seems to keep the custard from weeping is all. I found recipes for pumpkin, coconut, lemon, chocolate and a few others.