I think thats what it is called or maybe Oreo buttercream. Does anyone have a recipe? Thank you so much

Just crush up some Oreos (I actually use the Publix store brand as they are cheaper and actually taste better to me) and fold into your standard vanilla BC. I'd add just a bit at first and slowly add more until you get the flavor and consistency you want. You can crush the cookies up in a food processor or you can put then in a freezer bag and then pound them easily with a rolling pin.

Thank you so much, I was wondering if you use the cream in the middle or do you just use the cookie part?

Use the whole cookie.