01 -  Preheat oven to 400°F. Line a baking sheet with parchment paper. 
 02 -  In a large bowl, toss trimmed green beans with olive oil, minced garlic, and Cajun seasoning until evenly coated. 
 03 -  Arrange seasoned green beans in a single layer on the prepared baking sheet. Roast for 20 minutes, or until beans are crisp-tender and slightly blistered. 
 04 -  Remove from oven and transfer to a serving platter. Serve immediately.