Preheat the oven to 425 degrees. Spread the frozen green beans in a single layer on the sheet pan.
Drizzle with olive oil and toss to coat. Sprinkle with the garlic, salt, and pepper seasoning.
In a small bowl, combine the panko breadcrumbs, Parmesan cheese, and onion powder. Sprinkle the mixture evenly over the green beans.
Roast in the oven for 20 minutes. Remove the pan from the oven and gently toss the green beans. Spread everything back into an even layer. Bake for another 10–15 minutes, or until the breadcrumbs are golden brown and the green beans are tender.
