Instructions:
1. Preheat oven to 350°F and position the rack one level below center.
2. Mix butter, garlic, salt, and pepper.
3. Remove neck and giblets, tuck wings under or tie back.
4. Rub turkey with butter mixture.
5. Coat oven bag interior with 1 tbsp flour, add onion, carrots, celery, and turkey.
6. Seal bag, make small slits for steam, place in roasting pan.
7. Cook per turkey size (12-15 lb: 2-2.5 hrs, 15-20 lb: 2.5-3 hrs, 20-24 lb: 3-3.5 hrs) until internal temp reaches 165°F.
8. Rest for 20
