Place turkey breast in a large, zip-top bag. In a medium bowl, whisk together buttermilk, 1 tablespoon salt, 1 teaspoon pepper, 1 teaspoon poultry seasoning, and garlic. Pour buttermilk mixture into bag with turkey breast and seal tightly. Place in a baking dish to catch any drips and place in the refrigerator for 8-12 hours.

Preheat oven to 350 degrees. Remove turkey breast from buttermilk and pat dry with paper towels. Discard buttermilk. Place the turkey breast in a roasting pan, or on a baking sheet fitted with a wire rack.

In a small bowl, stir together oil, 1/4 teaspoon salt, 1/4 teaspoon pepper, 1/4 teaspoon poultry seasoning and 1/4 teaspoon paprika. Spread the oil and seasoning mixture over the turkey.

Cook in the preheated oven until a meat thermometer inserted in the thickest portion reads 165 degrees (approximately 1 hour 30 minutes). Let stand for 15-20 minutes before slicing and serving.