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Hi Susan -
Unfortunately full-fat Greek yogurt has even less fat than sour cream so it won't work here either. You can actually make your own creme fraiche at home: mix together heavy cream and buttermilk, and let it sit at room temperature until it reaches its desired thickness (around 8 to 24 hours).
Best,
The Milk Street Team
My grocery stores do not carry creme fraiche. I note you are not recommending substituting sour cream. What about whole fat Greek yogurt? Goat cheese?