The Eida guide is fairly simple. Any sufganiya under the Eida hechsher, no matter what filling is inside the donut, will be pareve if there are no frosted lines atop the sufganiya. Even chocolate frosting is pareve, if there are no lines on it.
Any Eida sufganiyot that have frosted lines across the top will be dairy.
Additionally, all Eida sufganiyot will be mezonot, as they are either deep fried or made with fruit juices.
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