Preheat oven to 350 degrees F (175 degrees C).
Rinse turkey and remove giblets. Salt and pepper to taste.
Sprinkle the bottom of a turkey size oven bag with flour. Place turkey, celery and onions in the bag. Seal bag and poke several holes in it with a fork.
Bake 3 to 3 1/2 hours, or until internal temperature of the thigh meat reaches 180 degrees F (85 degrees C).
Learn more about how to cook a turkey for Thanksgiving in our How to Cook a Turkey article!
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