Line a baking sheet with waxed paper or parchment paper. Set aside. Set out the pretzels, peanuts and peanut butter cups, so they are ready to go when you need them.
In the microwave, melt the chocolate candy quik according to package directions. (If using this product, it will come in a microwave-safe melting tray. This works well.)
In a separate microwave safe bowl, add the oil (or shortening) to the peanut butter chips, and microwave for 1 minute. Stir and heat on 30 second increments until completely melted and smooth.
Immediately spread the chocolate onto the pan into a large rectangle, about 1/4" thick. Pour the melted peanut butter chips over the top of the chocolate, and using a spatula, swirl the two together.
Working quickly, sprinkle on the pretzels, peanuts and peanut butter chips. Freeze for about 20 minutes for the bark to set and harden.
Break into snack sized pieces. Enjoy!
Notes
Storage: Bark can be stored at room temperature. Store in an airtight container or Zip-Loc bag. Will keep for up to 7 days at room temperature.Freezing: Bark does well when frozen. Store pieces in a freezer bag or container. When ready to serve let bark defrost at room temperature, for 4-6 hours.