Can I swap in low fat Greek yogurt for the cream?

Robin - if you're looking to reduce cream and/or fat, but like the idea of this dish, look for Murgh Makhani recipes without cream.

You could, of course- but yogurt brings a tang with it that might be out of place in the dish. If you are looking to cut fat, I think you might be happier if you used something like Half and Half, and cut back some on the butter.