Mix together olive oil, garlic powder, onion powder, oregano, thyme, and black pepper in a bowl. Rub the mixture all over the turkey, inside and out.
Place turkey in a roasting pan and cover with foil. Roast for 1 hour and 15 minutes.
Remove foil and roast for an additional 45 minutes, or until a thermometer inserted into the thickest part of the thigh reads 165 degrees F (74 degrees C).
Remove from oven and let rest for 15 minutes before carving.
Meanwhile, melt butter in a saucepan over medium heat. Whisk in chicken broth and cornstarch and bring to a boil. Simmer for 5 minutes, stirring occasionally, or until thickened.
Strain gravy into a bowl and season with salt to taste.
Serve turkey with gravy.
Interesting Facts
The ideal turkey size for roasting is 10-12 pounds.
It’s important to let the turkey rest before carving so that the juices can be reabsorbed.
Gravy can be made ahead of time and reheated when ready to serve.