Preheat the Oven:
Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper or aluminum foil for easy cleanup.
Prepare the Green Beans:
Rinse and trim the ends of the green beans. Pat them dry with a clean kitchen towel to ensure they roast properly.
Season the Beans:
In a mixing bowl, toss the green beans with olive oil, garlic powder, onion powder, salt, and pepper until evenly coated.
Arrange on Baking Sheet:
Spread the green beans in a single layer on the prepared baking sheet. Avoid overcrowding to ensure even roasting.
Roast:
Roast in the preheated oven for 15–20 minutes, tossing halfway through, until the green beans are tender with slightly crispy edges.
Garnish (Optional):
Sprinkle with grated Parmesan or drizzle with lemon juice before serving for added flavor.