Have you been wondering how and when you can substitute Greek yogurt for other things?? I know I have...and this nifty little pic shows you ways to sub plain Greek yogurt ( any brand will work; this is from the Chobani folks ). Keep in mind some brands are tarter than others - so the Fage plain would be a good sub for sour cream or mayonnaise, while the Dannon or more sugary brands would be better for creme fraiche or cream cheese.