Sour Cream (Best Option)
1:1 by volumeSour cream is a fermented dairy product like Greek yogurt, so it shares a similar acidity and fat content that helps create a tender, moist custard in bread pudding. The tanginess balances the sweetness, enhancing flavor complexity.
When substituting, use the same volume as Greek yogurt. Be mindful that sour cream is slightly thinner, so the custard may be a bit looser before baking but will set well.
The final bread pudding will have a slightly richer taste with a subtle tang, closely resembling the original texture and flavor achieved with Greek yogurt.