I want to make this (http://www.anecdotesandapples.com/maple-syrup-banana-bread) banana bread, but need a dairy free sub for sour cream. What purpose does the sour cream serve that I can replace with something else? Thanks!
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There is a tofu sour cream you can find in many supermarkets. This is dairy free and works well in baking
Since it's a quick bread recipe and the amount is only 2 TB, you can use dairy free yogurt in place of sour cream; I've used this sub a lot w/ out any problems.
Sour cream is usually used for tenderness, moisture and also leavening - it is an acid that may react with ingredients on a higher PH scale to produce carbon dioxide and increase the products' height. You could use coconut/soy yogurt if you have it I guess, but a teaspoon or a little more of vinegar, lemon juice or other acids would also work.