Remove the turkey and the gravy packet (if one is included) from the plastic. Set the gravy packet aside -you can use it or not when the turkey is finished cooking.
Leave the netting on the turkey - it holds it together during the cook time.
Mix the softened butter with the poultry seasoning until it is well blended.
Rub the butter mixture over the turkey on all sides. Don't worry about the netting.
Place in the slow cooker and cook on low for 3-4 hours, or until and instant-read thermometer registers 165℉.
Let stand 10 minutes before slicing.
Gravy
If you are using the gravy packet make according to instructions on the packet.
Notes
The poultry seasoning I use is from Wild Fork Foods and contains the following ingredients: salt, parsley, chives, minced garlic, minced onion, chili flakes, thyme. It is ground in large pieces not powdered.If you use a small grind/powdered poultry seasoning you'll want to use 1 ½ teaspoons and add about 1 teaspoon of kosher salt, and any other of the above ingredients you like. For example, McCormick poultry seasoning contains: thyme, sage margjoram, rosemary, black pepper, nutmeg.If you are using a Butterball or other turkey that has a solution injected in it you probably won't want to add any extra salt until after it's cooked.