Preheat Your Oven: Start by preheating your oven to 200°C (180°C fan). Line a large baking tray with parchment paper for easy clean-up.

Prepare the Beans: Wash the green beans and pat them completely dry with a clean tea towel or paper towels. This step is crucial for getting them to roast properly. Trim the stem ends off.

Season the Beans: In a large mixing bowl, add the trimmed green beans. Drizzle with the extra virgin olive oil and sprinkle over the garlic powder, onion powder, salt, and black pepper.

Toss to Coat: Use your hands or a pair of tongs to toss everything together until the green beans are evenly coated in the oil and seasonings.

Arrange on the Tray: Spread the seasoned beans in a single, even layer on your prepared baking tray. What works best for me is ensuring they have a bit of space between them. If they're piled up, they will steam.

First Roast: Place the tray in the preheated oven and roast for 10-12 minutes, or until the beans are starting to become tender-crisp.

Add the Parmesan: Carefully remove the tray from the oven. Sprinkle the freshly grated Parmesan cheese evenly over the hot green beans.

Final Roast: Return the tray to the oven and continue to roast for another 5-8 minutes. You're looking for the cheese to be completely melted, golden brown, and bubbling in places. Keep a close eye on it during this stage to prevent it from burning.

Serve Immediately: Remove from the oven and serve straight away while the cheese is gloriously melty and crisp.