In a medium-sized bowl, mix together the graham cracker crumbs, melted butter, and granulated sugar until well combined. Press into the bottom of a 9x13-inch pan.

Using an electric mixer, whip the heavy whipping cream until it forms stiff peaks, about 3-5 minutes.

In another bowl, beat together the cream cheese, confectioners' sugar, and vanilla extract until smooth and creamy.

Gently fold half of the whipped cream into the cream cheese mixture, then spread it evenly over the crust.

Sprinkle the mini marshmallows evenly across the cream cheese layer.

Microwave the semi-sweet chocolate chips and milk in 30-second intervals until melted and smooth.

Spread the cooled melted chocolate over the mini marshmallows.

Spread the marshmallow crème evenly over the chocolate layer.

Take the remaining whipped cream and smooth it over the top.

Garnish with additional graham cracker crumbs, chocolate chips, and mini marshmallows if desired.

Cover with plastic wrap and chill for at least 4 hours until set.

Once set, cut into squares and serve chilled.