Put pretzels in a plastic bag and crush into small bits.
In a medium bowl, combine peanut butter, butter, brown sugar and salt. Stir until all ingredients are completely blended and smooth.
Add pretzel bits to peanut butter mixture and mix thoroughly.
Add powdered sugar and, mix thoroughly.
Now take a spoonful of the mixture and form into a ball. (If the peanut butter starts sticking to your fingers, run your fingers under cold water, and begin rolling again).
Place balls onto a plate or cookie sheet lined with wax or parchment paper. Put into the freezer to chill for at least 20 minutes.
After the peanut butter balls have chilled, prepare your chocolate. Put the white chocolate into a small microwaveable bowl. Microwave for 30 seconds and then stir. Then continue this microwave/stir routine at 10 second intervals until the chocolate is completely melted.
Place one peanut butter ball into the melted chocolate and gently roll it around with a fork until completely coated. Remove from the bowl with the fork and place onto a sheet of wax or parchment paper. Repeat for all other balls.
Once they are all coated, place them back in the freezer for another 20-30 minutes.