Makes 30 pieces | 30 minutes, plus 2 hours to chill
Line an 8-in. square pan with foil, set aside.
Combine Torani Peppermint Syrup, sugar, milk, butter, and salt in a 4-qt. saucepan. Cook over medium heat, stirring until sugar has dissolved and butter has melted. Bring to a rolling boil and cook, stirring constantly, until a candy thermometer registers 230°F, 4 to 5 minutes. Remove pan from heat, quickly add marshmallows and chocolate, and stir vigorously until they have melted. Immediately pour the mixture into the prepared pan and sprinkle with candy canes. Chill, uncovered, until firm, about 2 hours. Cut into squares, wrap tightly in plastic wrap, and chill up to 2 weeks.