Preheat your oven to 425°F (220°C). Arrange a baking sheet with parchment paper for easy cleanup.
Place the green beans in a mixing bowl and drizzle with olive oil. Toss them well to ensure all beans are evenly coated, which helps achieve that crispy exterior during roasting.
Add the minced garlic, salt, and black pepper to the bowl. Toss again to distribute the seasonings evenly across all the green beans.
Spread the seasoned green beans in a single layer on the prepared baking sheet, making sure they are not overlapping for maximum crispiness.
Roast the green beans in the oven for about 15 minutes, shaking the pan halfway through to promote even cooking. Look for a slight char and crispy edges once they're done.
Remove from the oven and let the green beans cool slightly; they will become crunchier as they rest. Serve immediately for the best texture and flavor.