Combine in a mixing bowl the jalapeño powder, garlic salt, lemon pepper, ranch dressing mix, and oil.
Place a portion of the pretzels in a large Ziploc bag, then add the spice mix (proportional to the amount of pretzels in the bag).
Seal the Ziploc, then shake well to lightly coat the pretzels with the seasoning mix.
Remove the pretzels and repeat the process (if needed) to coat the next round of pretzels.
Serve immediately or, for best flavor, keep the pretzels sealed in the Ziploc bags for an hour or two to allow the seasoning to set.