Line a baking sheet with parchment paper or a silicone baking mat to prevent the chocolate from sticking.
Melt the milk chocolate in a heatproof bowl over a pot of simmering water (double boiler method) or in the microwave in a microwave-safe bowl in 30 second increments, stirring between each interval until smooth.
Pour the melted milk chocolate onto the prepared baking sheet, spreading it out evenly with a spatula until about 1/4 inch thick.
Place the 12 mini pretzels onto the chocolate for the reindeer antlers. Add 12 red M&M’s below the pretzels for the reindeer noses. Place candy eyes above the noses to complete the reindeer faces.
Scatter the green M&M’s and one teaspoon sprinkles over the bark while the chocolate is still wet for added festive color and texture.
Let the bark sit at room temperature until fully set, or place it in the refrigerator for about 30 minutes to speed up the process.
Once the chocolate is completely set, break it into pieces with your hands.
Notes
You’ll want to make sure the milk chocolate is fully melted and smooth before spreading it on the baking sheet. Otherwise, it will be lumpy and difficult to fully spread. You can customize your bark with extra toppings like crushed candy canes, nuts, or dried fruit, if desired.It can be made ahead of time and then stored for up to a week in an airtight container. These would also be cute to place in cellophane bags for a fun treat on Christmas Day.