Mix graham cracker crumbs, brown sugar, and melted butter in a bowl until well combined. Press into mini cake rings, ramekins, or a lined springform pan to form an even crust. Freeze while you make the filling.
Beat softened cream cheese, granulated sugar, vanilla extract, sour cream, and caramel sauce until smooth. In a separate bowl, whip cold heavy cream to stiff peaks, then gently fold it into the cream cheese mixture.
Spoon or pipe the filling over the chilled crusts and smooth the tops. Freeze for 6–8 hours or until firm.
Unmold and top with a scoop of vanilla ice cream. Drizzle with caramel sauce (thin with cream if needed) and sprinkle with crushed toffee or chocolate-caramel bits. Add a pretzel or cinnamon stick for garnish.