Crush the pretzels into medium-sized pieces and add them to a large bowl along with the marshmallows. You can set a few aside for the topping if you like.
Melt the chocolate and add it to the bowl. Mix well until the pretzels and marshmallows are evenly covered in the chocolate.
Transfer the mixture to your lined tray and spread it out into a rectangle shape. Top with leftover pretzels and marshmallows.
Place the bark in the fridge for around 2 hours, or until the chocolate is fully set. Then break or cut it into pieces and enjoy!
Video
Notes
Store in an airtight container at room temperature or in the fridge. This will last for a few days with pretzels on top, or up to 3 weeks without any toppings.