I have tried this, and it worked fine for me. I have used both nonfat and lowfat plain yogurts in cookie and quick bread recipes. The yogurt seems to keep the baked goods moist, the same as using applesauce would. Sometimes I use both applesauce and yogurt to equal the amount of fat called for and it always comes out just fine.
You can't use yoghurt instead of butter in cookies; butter is a shortening ingredient, which yoghurt is definitely not.
There are cookie recipes which include yoghurt in the ingredients - though not as shortening; you could try one of these.
A recipe for Bulgarian cookies - Masni Kurabii - which includes yoghurt is at the link below:
Yogurt is not a good substitute for butter in any recipe; yogurt is lower in fat, higher in liquid and far more acidic than butter. These qualities make it very different to butter, hence it's not a good substitute.
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.
You can make what is sometimes referred to as a "whisked sponge" (I think it may be the same as an angel food cake, but I'm not sure) it's also the same method used to make a Swiss roll sponge. It's a cake recipe that involves whisking egg whites with sugar until stiff peaks, then adding flour and the egg yolks (sometimes a leavening agent such as bicarb). The batter is then baked. This is completely free of butter, margarine or oil. The only downside is that the sponge does not last long before going stale (due to lack of fat) - you get a couple of days at most. You can also substitute applesauce or yogurt for the oil/butter in most recipes. it will change the consistency a little.
Butter is obtained from the milk , the milk is heated and changes in to yogurt ,this yogurt when churned releases cream this cream is actually called butter.
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You could substitute margarine for butter and yogurt for sour cream.
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Milk, butter, yogurt
There are many flavors of frozen yogurt. To name a few: Chocolate, Vanilla, Strawberry, Red Raspberry, Peanut Butter, Mint Chocolate, Dulce De Leche, Espresso, Green Apple, Pineapple Coconut, Banana, Cookies and Cream, Cheesecake, Black Cherry, Caramel, and a hundred more.
i don't see anything wrong with using yogurt although it might chage the consistancy of this dish but if you use plan yogurt it shouldn't chage the flavor. what you should do is try yogurt instead of buttermilk by making pancakes and see if you can taste or see a difference! if it is a success let me know!