Whip the butter with a paddle beater attached to an electric mixer on medium speed until creamy.
Add in the vanilla and beat in.
Add in the icing sugar, cup by cup, beating thoroughly after each addition.
Add in the cream until desired consistency is reached.
Mix in the Oreo cookies completely. You can beat it in until the cookies are small bits OR you can mix it in slowly, leaving cookies in large chunks. Add more cookies if desired!