1. Preheat oven to 275 degrees Fahrenheit (140 degrees Celsius).
2. In a large bowl, whisk together oil, honey, mustard, and onion powder.
3. Crush the pretzels into bits and add to the oil mixture, tossing to coat.
4. Pour the pretzels onto a Gefen Parchment Paper-lined baking sheet in an even layer.
5. Bake for 30 minutes, turning the pieces halfway through the baking.