Keep the cookies in their sleeve and pour the heavy cream over them. Let it soak in for 5 minutes then pour the excess heavy cream into a mixing bowl. Whisk to soft peaks, then sift in the powdered sugar and cocoa powder and whisk a few more times until you have billowy soft peaks.
Layer the cookies and chocolate cream in 2 individual serving dishes. Finish with a layer of cream as the top layer. Sprinkle with chocolate chips, then chill for one hour before serving.