Preheat the oven to 300Fº.
On a cookie sheet add the pretzels, and spread the pretzels out evenly across the sheet.
In a bowl add oil, sugar, and cinnamon and stir to mix ingredients together.
Pour the mixture over the pretzels and toss well to coat the pretzels evenly.
Place cookie sheet in the oven and bake uncovered for 30 minutes, stirring twice during baking time (once every 10 minutes).
Spread pretzels out as evenly as you can and let them cool before serving.
Store pretzels in an airtight container.