Crush pretzels and Oreos into 1″ bite-size pieces.
Arrange the Oreos and pretzels in the bottom of an 8″x8″ casserole dish in an even layer.
Place the candy melts in a microwave-safe bowl and heat in 25-second increments, stirring well in between each heating.
Once the candy melts are completely smooth and melted, pour evenly over the candy melts and smooth with an offset spatula.
Cover and let the pretzel bark set up on the counter – if you refrigerate, the candy melts will “sweat.”
Once completely set, break into small squares.