1) Preheat the oven to 200C/Gas 6.
2) Trim off the tough ends of the beans and arrange the trimmed beans on a nonstick baking tray. Drizzle with olive oil and season with salt and pepper, to taste. Sprinkle the cheese evenly over the top.
3) Bake until the cheese melts and forms a crisp shell over the beans, about 10 minutes. Remove from the oven and allow the beans to sit a few minutes for the cheese to cool slightly.
4) Lift the beans out onto a serving platter and serve.