Turkey and Dressing (Roast Turkey with Stuffing)

Name: Turkey and Dressing (Roast Turkey with Stuffing)
Prep time: 30 min
Cook time: 2 h
Total time: 2 h 30 min
Cuisine: American
Ingredients: 1 whole turkey breast (bone-in, approx. 2 to 2.5 kg); 2 tbsp unsalted butter (softened); 1 tbsp olive oil; 1 tsp salt; 1 tsp black pepper; 1 tsp dried thyme; 1 tsp dried sage; 1 tsp garlic powder; 1 tsp onion powder; 1 small onion (quartered); 1 small apple (quartered); 1 celery stalk (cut into chunks); 4 cups day old white bread (cubed); 2 tbsp unsalted butter; 1 small onion (finely chopped); 2 celery stalks (finely chopped); 1 clove garlic (minced); ½ tsp salt; ½ tsp black pepper; 1½ cups chicken broth (preferably low sodium); 1 egg (lightly beaten)