Yes, you can roast cauliflower florets instead of boiling them. To do so, preheat the oven to 180°C fan /200°C / 400°F, toss cauliflower florets in olive oil, salt, and pepper and roast for 25-30 minutes until tender and golden brown. Then, add the roasted cauliflower to a baking dish and pour the cheese sauce over it.