[Haskell-beginners] How to think like a functional programmer?

Hi Folks, I am working on a project and am trying hard to write the code in a functional style. Sadly, upon reviewing what I've written, I realize that I am not succeeding. I just devised a recipe for solving the problem and then created functions corresponding to steps in the recipe. I am still thinking imperatively, not functionally. Is there a book or article that describes how to approach problems from a functional mindset? How did you "flip the switch" in your brain to the functional mindset? /Roger