Adjust an oven rack in the lower third of the oven and preheat to 425 F. Line a large baking sheet with foil. Arrange the green beans on the baking sheet and drizzel them with the sesame oil. Shake to coat evenly, then season with the garlic powder, furikake, pepper flakes and a pinch of salt. Toss well. Take until browned on the bottom - about 10 minutes. Shake the pan or stir the beans and bake until golden and slightly browned on the edges - another 5-6 minutes. Remove from oven and serve hot.