01 - Preheat oven to 350°F.
02 - Combine smoked paprika, sweet paprika, garlic powder, onion powder, dried thyme, dried oregano, black pepper, kosher salt, olive oil, lemon zest, and lemon juice in a small bowl to form a paste.
03 - Pat turkey breast dry using paper towels. Gently loosen the skin and spread half the spice paste beneath the skin; rub the remaining paste evenly over the top surface.
04 - Place minced garlic, quartered onion, lemon slices, and optional herb sprigs into a roasting pan. Set the turkey breast on top, skin side up.
05 - Roast in the preheated oven for 1 hour 20 minutes to 1 hour 30 minutes, or until internal temperature reaches 165°F, basting once or twice with pan juices during cooking.
06 - Remove from oven and loosely cover with foil. Let rest for 10 to 15 minutes before slicing.
07 - Serve turkey with pan juices and fresh herbs as desired.