My mate Barb makes this wonderful dish brilliantly, even after half a bottle of white wine:)
you can add tomato paste if you like, or even chopped capsicum or mushrooms.
This dish is fine with just wine and water, but much much better with well flavoured chicken stock. I like to use about 1/2 cup of stock that I get when I do chinese chicken wings.
You can use lite sour cream for this dish, but the sauce with most likely seperate, still tastes great though.