Every Thanksgiving I make this gravy for my family. I keep it gluten-free for my mom by using cornstarch and by adding layers of flavor with fresh herbs and roasted garlic so even if your bird doesn’t render a lot of drippings you still have a delicious gravy.
Peel most of the papery skin away from the garlic head. Place on a cutting board and cut off the top 1 inch. Discard the top. Place the garlic head on a small sheet of foil. Drizzle with extra-virgin olive oil and lightly sprinkle with salt. Tightly wrap and place on a small sheet tray in case it leaks. Roast until golden brown and soft, 55 to 65 minutes. Remove and let cool slightly.
Meanwhile in a medium saucepot, combine the chicken stock, thyme, oregano, sage, rosemary and bay leaves. Bring to a simmer and then reduce the heat to low, cover and cook for 30 minutes.
Add the reserved drippings to the pot. Squeeze in the roasted garlic from the head. Stir and then remove from heat. Strain through a fine-mesh sieve into a medium bowl, pushing the garlic through, then pour the strained stock back into a clean pot. Add in some freshly cracked black pepper and more salt, if needed.
To make the slurry, combine 1/2 cup of the cornstarch with 1/2 cup cold water in a small bowl. Whisk together.
Bring the stock back up to a simmer over medium. Slowly whisk in the cornstarch slurry and then bring to a boil to thicken. If the gravy looks too loose, make another slurry with the remaining cornstarch and slowly whisk in a little bit at a time until you feel the gravy thicken. Taste for seasoning. Keep warm until needed.