Is it true that if I add 1/4cup of mayo to all my recipes, it will always be moist? Or adding 1/4 cup of sour cream? which is it ? if not these ideas, what other ideas are out there for moist cakes??

I can testify to the sour cream. mmmmmmm moist and yummy.

I don't know if I can say they'll always be moist, but I've made chocolate mayonnaise cakes for years and it works. Mayonnaise is eggs and oil, just like in cake.

yeah... hootersAlicia is right.. mayonnaise has eggs in it.. so basically acts as a good emulsifier..

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If you want moist without adding extra fat and cholesterol, you should try adding applesauce. A half cup of (unsweetened) applesauce doesn't make much of a difference in taste, but makes a great deal of difference to the moistness of a recipe. In addition, if you have a recipe that calls for oil as an ingredient, you can substitute up to half of the oil with applesauce without losing any of the moistness of the original recipe. When I turn my vanilla cake recipe into cupcakes I add a half cup of apple sauce to the recipe and they turn out perfect (without the applesauce they're rather dry even though the cake is perfectly moist). Actually, for the super mario and angry birds cupcakes I used mango puree instead and they were not only moist, but had an excellent hint of mango flavor as well which my nephew and his little friends liked.