Cheese-Topped Thanksgiving Casserole with Turkey

Ingredients

• 6 medium potatoes, peeled and cut into chunks
• 1-1/4 cups chopped celery
• 3/4 cup chopped onion
• 1/2 cup butter, cubed
• 6 cups unseasoned stuffing cubes
• 1 teaspoon poultry seasoning
• 1/4 teaspoon rubbed sage
• 1 cup chicken broth
• 4 cups cubed cooked turkey
• 2 cans (10-3/4 ounces each) condensed cream of chicken soup, undiluted
• 1 teaspoon garlic powder
• 3/4 cup sour cream, divided
• 4 ounces cream cheese, softened
• 1/2 teaspoon pepper
• 1/4 teaspoon salt
• 1-1/2 cups shredded cheddar cheese