Add 8 chocolate sandwich cookies to the bowl of a food processor. Pulse until coarse cookie crumbs form. Some larger chunks are fine as long as they are smaller than a pea but the majority should be crumbs. Set aside.
Add the butter and powdered sugar to the bowl of a stand mixer and beat until completely smooth.
Turn the mixer to a medium-high speed and beat for 3 minutes. Add the vanilla extract and heavy cream and beat on medium-high for an additional minute.
Add the Oreo cookie crumbs to the buttercream.
Mix until combined and there are no longer any streaks without cookie crumbs.
Pair this frosting with gluten free brownies, gluten free chocolate cake, gluten free chocolate cupcakes, and more! There are several serving suggestions linked in the post.