Pull the butter out about 30 - 60 minutes before making the recipe.
Cream the softened butter until smooth. This takes about 1 -2 minutes on low speed. Stop and scrape down sides of bowl as needed.
Mix in the sifted powdered sugar ½ cup (60 g) at a time, beating each addition of powdered sugar until incorporated. Scrape down sides of mixing bowl as needed.
Once all the sugar has been added, mix in the vanilla extract, salt and 2 tablespoons (30 ml) heavy cream.
Beat on high for 6 - 8 minutes or until the Oreo butter cream filling is to your desired consistency.
Once the buttercream is light and fluffy, fold in the crushed Oreo cookies to make the cookies and cream frosting.
Prepare the frosting for topping cakes or cupcakes or to store until you are ready to use.
