Preheat oven to 200 degrees.

In a small bowl, whisk together oil, cayenne, garlic, and ranch.

Spread the pretzels in a single layer on a baking sheet. You will probably need two sheets.

Pour oil mixture over the pretzels and stir well to coat.

Bake for 1 hour, stirring every 15 minutes.

Remove from oven and let cool. Store in an airtight container for at least 1 week.