The year I was married, 1984, I went to my in laws for Thanksgiving. I was blown away by the turkey! It was the most moist and tender turkey I had ever eaten. When I learned of the cooking method I was amazed, I had never heard of cooking a turkey this way, and I am telling you, it is the best. I will not cook one any other way.
Preheat oven to 450. (This is not a typo, it is 450.) Stuff turkey, if desired. Make a tent all the way around a 12-20 lb turkey, making sure there are no unsealed areas. (This is an important step.) Place turkey on a baking sheet. Bake for 3 to 3 ½ hours. Add 1/2 hour if it is stuffed.Unfoil the last 15 minutes to let the turkey brown. Make sure the turkey timer has popped up to ensure it is thoroughly cooked.