This is a very informative article and one every cookie baker should read. Logically, I know this about butter, but can’t say I always follow it. Sometimes my softened butter is definitely over 65 degrees and I’ve been known to soften butter in the microwave……and often!
But this is good information to keep in mind. In fact, I think today I will stick a digital thermometer in the butter and see how long it takes for it to come down to 65 degrees F.