Ingredients

Vegetables

  • 1 large head cauliflower, cut into medium florets
  • 12 oz (340 g) mushrooms, halved or thickly sliced
  • 3–4 tbsp olive oil
  • 4–5 cloves garlic, finely minced
  • 1 tsp dried Italian seasoning
  • ½ tsp dried thyme
  • ½ tsp smoked paprika
  • ½ tsp red pepper flakes, optional
  • ¾ tsp salt
  • ½ tsp freshly ground black pepper

For finishing

  • 2 tbsp butter
  • 1 tbsp fresh lemon juice
  • 2 tbsp fresh parsley, finely chopped
  • 1 tbsp grated Parmesan, optional
  • Extra black pepper
  • Pinch of red pepper flakes, optional

1. Prepare the cauliflower

Preheat your oven to 425°F (220°C).

Cut the cauliflower into fairly large bite-sized florets. Try to keep them similar in size so they cook evenly.

Important: Dry the cauliflower very well. Excess water will cause it to steam rather than roast.

2. Season the cauliflower

Put the cauliflower into a large bowl.

Add:

  • 2 tbsp olive oil
  • ½ tsp salt
  • black pepper
  • Italian seasoning
  • thyme
  • smoked paprika
  • red pepper flakes

Toss thoroughly until everything is coated.

Spread the cauliflower onto a large baking sheet in one layer.

Don’t crowd the pan.

3. Roast the cauliflower

Roast for approximately 15 minutes.

Take the tray out and turn the cauliflower pieces over.

4. Prepare the mushrooms

While the cauliflower is roasting, slice or halve the mushrooms.

Toss them with:

  • 1–2 tbsp olive oil
  • a pinch of salt
  • black pepper

I recommend not adding the garlic yet. Minced garlic can burn during a long roast.

5. Add the mushrooms

After the cauliflower has roasted for 15 minutes, add the mushrooms to the baking sheet.

Spread everything out again.

Return to the oven for another:

12–15 minutes

until the cauliflower has browned around the edges and the mushrooms are golden and slightly caramelized.

For the appearance in your picture, let some of the cauliflower develop deep golden-brown spots.

6. Make the garlic butter

While the vegetables finish roasting, melt:

2 tbsp butter

in a small skillet over medium-low heat.

Add the minced garlic.

Cook for about 30–60 seconds, just until fragrant.

Don’t brown the garlic heavily.

Turn off the heat and stir in:

  • 1 tbsp lemon juice
  • 1 tbsp chopped parsley
  • a little black pepper

7. Toss everything together

Transfer the hot roasted cauliflower and mushrooms to a large serving bowl.

Pour the garlic butter over them.

Add:

  • remaining fresh parsley
  • Parmesan, if using
  • another pinch of red pepper flakes

Toss gently until everything is coated.

Taste and adjust the salt and pepper.

🔥 The secret to getting it like the photo

For those deeply roasted, almost crispy edges, these details make a big difference:

Don’t overcrowd the pan

Use two baking sheets if necessary. Vegetables touching each other release steam and won’t brown properly.

Use high heat

425°F / 220°C gives you much better caramelization than a low oven.

Keep the mushrooms relatively large

Halved or thickly sliced mushrooms retain some texture instead of disappearing into the dish.

Add garlic near the end

This gives you strong garlic flavor without burnt garlic.

Finish with lemon

The small amount of acidity makes the roasted vegetables taste much brighter.

🌿 Optional restaurant-style version

For an even richer dish, add:

  • 1 tbsp grated Parmesan
  • 1 tsp Dijon mustard to the garlic butter
  • a tiny drizzle of extra-virgin olive oil after roasting
  • fresh parsley and thyme
  • a pinch of chili flakes

Serve immediately while the cauliflower is still hot and the mushroom edges are caramelized.

The pictured dish appears to be roasted rather than boiled cauliflower, so I would skip blanching it—the direct roasting is what gives it those browned, nutty edges.