In a small bowl, combine the Cornflake crumbs, sugar, melted butter and cinnamon. Press half of the crumb mixture into a lightly greased 9-inch springform pan.
Spoon half of the softened ice cream over crust and level the top. Sprinkle with the remaining crumb mixture. Cover and freeze for 1-2 hours or until firm.
Top with remaining carton of ice cream. Cover and freeze for at least 6 hours or overnight.
Let cake stand at room temperature for 5 minutes before remove the sides of the pan. Serve with caramel or chocolate sauce, whipped cream and maraschino cherries, if desired.