Brown Sugar Is The Key To Meringue Cookies With A Deeper Flavor - Tasting Table
Briefly

But granulated white sugar is not the only type of sugar that can be used...meringues should not just be limited to one kind of sugar.
When brown sugar is used in meringues, it gives the cookies a lovely caramel color and a decadent flavor to match... can be used as a substitute for white sugar in a one-to-one ratio.
Read at Tasting Table
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