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I know there's a recipe for Mayonaise cake that is super moist.

I am baking sugar free brownies that are a bit dry, box recipe. I'd like to use mayo instead of oil and see if it comes out moister. However I am not sure what the equivalent? I know in the cake mix the oil is double. Not sure if the brownie mix would be the same?

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2 Answers 2

Note that basic mayonnaise normally is made from egg yolks, oil, mustard, citron juice, salt and pepper. This is means that the flavors in mayonnaise are a bit sour. This is normally compensated with sugar in the recipe, but you are using a non-sugar recipe.

I think the idea of adding mayonnaise for the texture is ok. However I experienced the effect of making a cake becoming more moist from some other ingredients from which i think they fit more properly in a brownie recipe. You could replace the amount of oil by the same amount of applesauce. Or add some additional applesauce to the recipe (2 tablespoons I would say) The flavors of applesauce do not seem to change the flavor of a cake a lot in practice. And applesauce is used in a lot of recipes to bake low fat. So in stand of sugar free you now have low fat brownies. If you still want it to be sugar free you can use or make some sugar free applesauce of course. If you don't want to use applesauce you good think of adding a couple of tablespoons of vanilla pudding to the recipe. Or even chocolate pudding, to give your brownies even more chocolate flavor. Also replacing some of the water you use in the recipe by some more oil can work. The water while evaporate during the baking. However, the oil does not do that, and stays liquid at room temperature after baking. This causes an moisty effect.

Note that you will almost always add some more sugar/oil in the recipe if you only want to use 'instant' products. If you want to make non-sugar/low fat brownies this may not be what you want. So you could also think about undercooking your brownies a little. So shorten the cooking time a little bit, so you don't cook your brownies 'dry' but still a bit undercooked in the middle. This makes it very moist, and personally I think the 'undercookedness' of brownies it actually the best think about them.

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I would keep the weight of the mayo the same as the weight of the oil using this conversion site: http://www.onlineconversion.com/weight_volume_cooking.htm

The other nifty trick to chewy gooey moist brownies is to pre-cook a quarter to a third of the dry mix with the entire water amount. Cool a bit and add in the rest of the dry plus the mayo. This also reduces the baking time somewhat if dough goes in warm.

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