The answer is yes. You can use Greek yogurt instead of heavy cream. In addition, substitutes for light cream may not be necessarily needed in this recipe when you are using Greek yogurt instead of heavy cream. Moreover, Greek yogurt is thicker than regular yogurt so it won't whip up quite as nicely in a mixer. But it will work just fine if you want that rich and creamy consistency without all of that extra fat. Just check the label and find a brand that doesn't have any added sugar. Too much sugar can inhibit fat loss and make your food taste awful.