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This is very true, I mean as DDT isn’t spoken about outside of professional circles, I’m assuming it would be difficult to find out the optimal batter temperatures for cookies, cakes etc. I wonder also if different flavour cakes so for example chocolate and vanilla have different optimal batter temperatures or whether they’re the same..
It’s not the flavor the cake that matters. It’s about the leavening, so in butter cakes where the butter is creamed, you want the temperature of your butter to be stay around 68°F (20°C). If the butter heats up a couple of degree above that, its too soft to expand and hold its shape. So it cannot effectively trap the gas bubbles created from the leavening. The cake ends up denser with a lower rise.
A cake leavened with whipped egg whites can lose volume if you are not careful about the temperature of the egg whites. While warm egg white beat up with more volume, colder whipped egg whites stay more elastic and do not collapse like warmer whipped egg whites. Most recipes state room temperature egg whites—whatever that is suppose to mean. Keep the egg whites and liquids around 68°F (20°C). When egg whites are beaten properly it will be a long slow process, so the friction will heat them up. So keeping your liquids at 68°F (20°C) will keep the egg whites cool in the batter and keep them from collapsing too quickly in the early stages of baking.
You notice how my cakes always rise to maximum height and never sink in the center—part of that is good formula, the other part is correct temperature. Just try to keep things around 68°F (20°C) and you will be fine.