I'm not sure if anyone will see this now but I have made scalloped potatoes for most of my adult life. Recently, though, I've made them several times and they turn a ghastly color somewhere between grey and a sort of a brown color and they look terrible! They taste fine, but the color is a turn off. They do this while they are baking because prior to baking they are fine. I layer the potatoes with onions and a white sauce that I add oregano to. What could possibly be doing that? thanks for any help!

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