I have a very old mushroom croissant recipe (if I can still find it). I know you didn't mention mushrooms, but some of the ingredients I'm trying to recall sour cream, cheese, garlic (the mushrooms), chopped celery. Sure you could add parsley and the flakes to the mix - and it was rolled up inside the croissant. To be honest, I kept adding things & didn't write down the additions to the recipe. If you're interested, give me a wave. Or, you might find a mushroom croissant/turnover recipe on the web you could adapt w the flavors you remember and omit the shrooms.
P.S. I brought my dish to a Thanksgiving dinner years ago and everyone gobbled it up. If only I could duplicate it again.