1. Preheat your oven to 400º F (200º C). This temperature is perfect for roasting and gives the cauliflower that beautiful caramelization.
2. Line a large baking tray with parchment paper. This makes for an easy clean-up once the roasting is done!
3. Remove the outer leaves of the cauliflower and cut the florets into large, bite-sized chunks. You want them to roast evenly, so don’t make them too small.
4. Lay the cauliflower out in a single layer and drizzle over the extra-virgin olive oil. Use your hands to coat the florets evenly.
5. Season the cauliflower generously with salt and black pepper. This step is crucial for enhancing the flavors!
6. Roast in the oven for 25 minutes until tender and caramelized on the edges. Keep an eye on them; you want a nice golden-brown color.
7. While the cauliflower roasts, bring a large pot of water to a boil and add a generous amount of salt. This is for seasoning the pasta.
8. Add the spaghetti and cook until al dente—usually about a minute less than the package suggests. This ensures it doesn't get mushy when mixed with the sauce.
9. Meanwhile, peel and finely slice the garlic. This will be sautéed to create a fragrant base for the sauce.
10. In a deep skillet, heat the butter and olive oil over low heat. The combination will complement the garlic beautifully.
11. Add the sliced garlic and sauté for 2 minutes. Be careful not to let it color; we want to maintain that sweet flavor.
12. Pour in the heavy cream and bring to a boil. This is where the magic happens!
13. Add in the thyme leaves, salt, and black pepper. Reduce the heat and let it simmer for 3 minutes, allowing the flavors to meld.
14. Before draining the pasta, scoop out 2 cups of the cooking water; set it aside. This starchy water will help bring the sauce together.
15. Drain the pasta in a colander and return it to the pot. Add the pasta and ½ cup of the reserved pasta water to the skillet with the sauce.
16. Place it over medium heat and gently turn the pasta in the sauce. You want to coat each strand perfectly with the creamy goodness. Add more cooking water if needed.
17. Finally, stir in the roasted cauliflower and serve hot. It’s best enjoyed with a sprinkle of grated parmesan and a few extra thyme leaves on top for garnish!