Preheat Oven:
Begin by preheating your oven to 400°F (200°C).
Prepare Cauliflower:
Remove the leaves and trim the stem of the cauliflower head, ensuring it sits flat. Rub the entire head with oil and season generously with salt and pepper.
Place the cauliflower in a baking dish and roast in the preheated oven for about 30-35 minutes, or until the surface is crispy and slightly golden.
Make Creamy Mushroom Sauce:
While the cauliflower roasts, melt butter in a saucepan over medium heat. Add the diced onion and sliced mushrooms, sautéing until the mushrooms are golden and the onions are translucent.
Add the chopped garlic and thyme, cooking for another minute until fragrant.
Deglaze the pan with the white wine (or broth), letting it reduce slightly.
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