In a medium bowl whisk powdered sugar, cocoa powder, and salt.
Add 2 tablespoons of milk and all of the vanilla.
Whisk to combine.
The mixture may be thick. Add milk, one tablespoon at a time, whisking in between each tablespoon, until the glaze is thick but still pourable.
Dip each donut into the glaze and shake (lightly) to remove any excess glaze.
Return the donut to the cooling rack and sprinkle with crushed oreos. I kind of pressed the crushed oreos into the glazed donuts, this seemed to keep them from sliding off.
Allow the donuts to rest for a minute or two, this gives the glaze a chance to harden, and then enjoy!
These are best when eaten right away, but if you do have leftovers they are still good the next day, as long as they are kept in an airtight container.