Preheat the oven to 425°F and line a baking sheet with parchment paper.
Use a paper towel to pat dry the green beans and remove any moisture. Spread onto the prepared baking sheet.
Drizzle the beans with olive oil and season with salt, pepper, and garlic powder. Use your hands to toss the beans with the oil and seasonings until evenly coated, then spread out in a single layer.
Roast in the preheated oven until beans are crisp-tender and have some golden spots, 20-25 minutes.
Notes
Storage: Kept in an airtight container in the fridge, they'll last for up to 3 days. You can reheat them in the microwave until warmed through or pop them into a 425°F oven or toaster oven until they're hot again!