01 - Pulse cookies into fine crumbs using a food processor or crush with a rolling pin. Combine crumbs with melted butter until mixture is uniform. Press firmly into the bottom of six serving glasses or ramekins. Refrigerate to set.
02 - Beat softened cream cheese and powdered sugar in a large bowl until smooth. Incorporate peppermint extract and red food coloring if using, mixing thoroughly.
03 - In a separate chilled bowl, whip heavy cream to stiff peaks using an electric mixer or whisk.
04 - Gently fold the whipped cream into the cream cheese mixture until just combined.
05 - Fold crushed peppermint candies into the mousse mixture carefully to preserve texture.
06 - Spoon or pipe the mousse evenly over chilled cookie bases and smooth the surface.
07 - Refrigerate the assembled layers for at least 2 hours to firm up.
08 - Before serving, top with whipped cream, additional crushed peppermint candies, and garnish with fresh mint leaves if desired.