Preheat the oven to 350°F. Line a sheet tray with parchment paper and spread the flour into an even layer. Bake for 7 minutes. Let the flour cool completely.
Take 5 of the cookies and crush them almost into crumbs. Take the additional 5 cookies and break them up into larger pieces, set aside.
In the body of a stand mixer with the paddle attachment, cream the butter with the granulated and brown sugar for 3 minutes.
Add the powdered sugar a little at a time until combined.
Then add the cocoa powder a little at a time until combined, scrape down the sides as needed.
Add the milk and vanilla. Slowly stir it in until combined.
Add the flour and stir it in until there are no dry patches, scrape the sides as needed.
Lastly, add both of the crushed cookies and the mini chocolate chips. Stir until just combined, serve.
Notes
Other Oreo flavors can be added, see some suggestions above.
This can be frozen, see above on how to do that.
You do not have to add the cookies to the dough.
Other additions can be added, see above for suggestions.