Place mixing bowl and whisk in the freezer at least 15 minutes before making your whipped cream.
Mix powdered sugar and cocoa powder in a small bowl and set aside.
Take the mixing bowl and whisk out of the freezer and add the whipping cream. Whisk between medium to high speed for about 1-2 minutes or until it thickens.
While still whisking add the dry ingredients very slowly. Remember to scrape the sides of the bowl to incorporate well all of the ingredients. Keep whisking at high speed for about 2-3 minutes or until soft peaks form.