I personally use yogurt in place of butter in banana bread and oatmeal cookies, any cookies actually. I have never tried muffins but assume it works about the same.
For cookies it turns out very light and they puff up better, for bread it helps keep it moist and tastes great.
Applesauce is a good substitute. Other pureed fruits may also work. Some use yogurt, butter, margarine, egg whites, sugar, or honey as substitutes. Many low-fat products make up for the fat with sugars, making the product higher-calorie than the original.
The yogurt component is acidic.
yes
blueberry
Yogurt, Alpacas and little muffins
A great substitute is soy yogurt.
Buttermilk.
you can substitute yeast with curd /plain yogurt
indian vegetable yogurt
Sour cream.
You can use Sour Cream of Mayonnaise as a substitute of yogurt.
They proposed to use yogurt as a substitute for meat in school lunches in 1996.