To Make the Peppermint Mousse Layer: Combine cream cheese, sweetener, peppermint extract, and milk together in the bowl of a stand mixer, or with a hand mixer. Mix until completely combined. Fold in the Tru Whip.
Putting it all together: Place a single layer of cookies in the bottom of a 8x8 inch pan, Top cookies with half of the mousse mixture and spread evenly. Repeat layers once.
(Note: You could use a square or round pan. I used a springform pan which made it easy to decorate before serving. I simply removed the outer part of the pan and spread some additional Tru Whip around the edges making it beautiful for serving!)
Cover the dish and refrigerate overnight or for at least five hours to give the cookies time to soften a bit. When ready to serve, top with additional whipped topping if desired and crushed peppermint candy!