Creating a delicious turkey and gravy is straightforward if you follow these steps:

1. Preheat the Oven: Preheat your oven to 325°F (165°C).
2. Prepare the Turkey: Remove the turkey from its packaging and remove the giblets from the cavity. Rinse it under cold water and pat dry with paper towels.
3. Season the Turkey: Rub the turkey with salt, pepper, and half of the dried thyme and rosemary. Place the diced onion and garlic inside the cavity for added flavor.
4. Roast the Turkey: Place the turkey on a roasting rack in a large roasting pan. Roast in the preheated oven for about 13-15 minutes per pound, or until the internal temperature reaches 165°F (74°C) in the thickest part of the breast.
5. Make the Gravy Base: While the turkey is roasting, melt 1 cup of butter in a large saucepan over medium heat. Add the remaining thyme and rosemary, stirring to combine.
6. Add Flour: Gradually whisk in the flour, cooking for about 2-3 minutes until golden brown. This creates a roux for your gravy.
7. Pour in Broth: Slowly add the turkey or chicken broth, whisking constantly until smooth. Bring to a simmer and cook for 10-15 minutes until thickened. Season with salt and pepper to taste.
8. Rest the Turkey: Once the turkey is done, remove it from the oven and let it rest for 20 minutes before carving. This helps retain the juices.
9. Serve the Gravy: Strain the gravy through a fine mesh sieve to remove any lumps or bits. Adjust seasoning if necessary.
10. Carve the Turkey: Slice the turkey and arrange it on a serving platter. Pour gravy over the turkey or serve it on the side.

Following these steps will guide you in creating a succulent turkey with a rich gravy that will delight your family and friends.