Preheat the oven to 325 F.
Rinse the turkey under cool water, then pat dry.
Combine all of the seasonings: Salt, pepper, thyme,sage,onion powder, and garlic powder.
Season the turkey with the seasonings, and rub all over.
Sprinkle the all purpose flour into a large freezer bag, then place the turkey into the bag.
Close the bag, and shake until all of the turkey is nicely coated with the flour( don't toss out the excess flour).
Place a large pan on the stovetop and add in 3 tbsp of vegetable oil, and 2 tbsp of butter.
Melt the butter, and heat up the oil over medium heat.
Once the oil & butter is nice and hot, add in the turkey.
Brown all surfaces of the turkey, then remove from the pan, and put the turkey into a large bake dish.
Head back to the stovetop and toss in all of the chopped vegetables.
Season the vegetables with salt and pepper to your preference, and cook the veggies, over medium heat, until they are translucent.
Once done turn off the heat, and add the veggies into the bake dish with the turkey, but reserve the oil/butter mixture.
Cover the bake dish with foil, and bake the turkey for 2 hours ( on 325 F).