Then, using a hand mixer, whip the cream cheese until soft and fluffy, then add heavy whipping cream, vanilla extract, salt, powdered sugar, and unsweetened cocoa powder. Whip again until smooth and stiff peaks form. After that, add the whipped cream to a piping bag and carefully pour about ¼ cup of the mixture into the prepared cups. Next, add another layer of crushed Oreos and a layer of whipped cream.