Tie and cut slits in oven bag: Close oven bag with the tie included with oven bag. If you put a lot of veggies in the bag, it may extend the time it takes to cook the turkey. Roast: Bake until turkey registers 165 degrees in thickest portion of breast in several places and 175 in thigh. Cooking your 20-lb. Below are timelines for cooking a whole unstuffed turkey in a roasting bag in a preheated oven at 350°F (175°C) to an internal temperature between 165 and 180°F (85°C). Remove turkey from oven. Cut 6 slits across top of the oven bag to allow steam to escape then tuck ends of oven bag into the pan. Total cooking time is 3 hours regardless of the size of the turkey. ; How long do you cook a turkey in an oven bag? Most turkeys are cooked at 325, but this recipe calls for 350 degrees. Tear away paper bag in pieces and let turkey rest for at least 20 minutes … Sprinkle the turkey with salt and pepper if desired. Roasting a turkey in an oven bag takes around two hours, but varies depending on the exact size and temperature of the oven. ; Seal the turkey bag with the tie. Be sure to have the bag loose around the turkey. The bag will look and smell charred, but the butter keeps the bag from burning and the bird will be perfect. Oven bags are manufactured from a high-heat-resistant polyamide film, safe for cooking in the oven and microwave oven. https://www.thekitchn.com/how-to-roast-a-turkey-in-an-oven-bag-251015 How long do you cook a turkey in an oven bag? This makes a nice thick gravy. The bag speeds up the process of the cook time and insures a moist turkey every time. Course Main Course Refer to times listed below for an estimate. Use a sharp knife to cut 3 slits in the top of the bag. When the turkey is done, take it out of the bag and then put the vegetables along with the juice that cooks out of the turkey, in the food processor. The oven bag keeps the turkey surrounded in its natural juices, producing a moist turkey with more flavor.