Line an 8 x 8-inch pan with foil and set aside.
Add chocolate chips, sweetened condensed milk, and kosher salt to a medium heavy-bottomed saucepan over medium-low heat. Melt the chocolate, stirring frequently.
Remove from heat and stir in vanilla extract. Fold in chopped peppermint bark.
Pour into prepared dish and spread with an offset spatula. Sprinkle with crushed candy canes.
Cover with plastic wrap and refrigerate for 2 hours to set.
Remove from refrigerator and remove from baking dish. Cut into squares.
Store in layers with wax paper in an airtight container.