Preheat oven to 200˚C. Grease a baking tray with oil.
Trim the stem of the cauliflower so that it sits flat. Combine the oil and garlic in a small bowl.
Brush the oil mixture over the cauliflower. Bake for 40 mins or until the cauliflower is almost tender. Brush the cauliflower with the remaining oil mixture.
In the meantime; prepare the Knorr Three Cheese Sauce as instructed on the packaging.
Pour the sauce over the cauliflower, followed by the cheese and bake for a further 15 minutes or until golden and the cauliflower is tender.
Remove from the oven and sprinkle the nuts and spring onion over. Serve immediately.