Carefully slice the top off the head of garlic, exposing the individual cloves inside. Drizzle the exposed cloves with olive oil, ensuring they are well coated. Wrap the garlic tightly in aluminum foil to prevent burning, and place it in the oven. Roast for approximately 30 to 35 minutes, or until the garlic cloves are soft and beautifully caramelized. Once roasted, remove from the oven and let it cool slightly.
While the garlic is roasting, fill a large pot with water, add a generous pinch of salt, and bring it to a boil. Add the fettuccine pasta and cook according to the package directions until al dente. Before draining, reserve 1 cup of the starchy pasta water, then carefully drain the pasta in a colander.
In a large skillet set over medium heat, melt the unsalted butter. Once melted, squeeze the roasted garlic cloves out of their skins into the skillet, discarding the skins. Gently mash the garlic with a fork to create a fragrant paste that will infuse your sauce.
Gradually pour the heavy cream into the skillet, stirring well to combine with the mashed roasted garlic. Bring the mixture to a gentle simmer, allowing the flavors to meld together.
Slowly whisk in the grated Parmesan cheese, stirring continuously until it is fully melted and the sauce becomes smooth and creamy. If you find the sauce too thick, add some of the reserved pasta water, a little at a time, until you reach your desired creamy consistency.
Taste the sauce and season generously with salt and freshly ground black pepper according to your preference.
Add the cooked fettuccine to the skillet, tossing gently but thoroughly until each strand is coated in the rich, creamy sauce.
Serve your Creamy Roasted Garlic Alfredo immediately, garnished with a sprinkle of finely chopped fresh parsley for a vibrant touch and a hint of freshness.
Notes
For a lighter version, use half-and-half instead of heavy cream.