Whisk together oil, mustard, honey, and onion powder.
Taste and adjust to your liking.
Break pretzels into small bite-sized pieces. (Either break by hand or smash the bag with a rolling pin.) Transfer pretzels to a large bowl.
Pour honey-mustard mixture over pretzels and toss to coat evenly.
Pour pretzels onto a rimmed baking sheet lined parchment paper or a baking matt. Spread into an even single layer (this is important to get them crisp).
Bake at 275°F for 30 minutes turning/tossing halfway through.