01 - Preheat oven to 275°F. Pat turkey breast dry using paper towels.
02 - Mix olive oil, garlic, thyme, rosemary, paprika, salt, pepper, and lemon zest in a small bowl.
03 - Rub the mixture thoroughly over the turkey breast, including beneath the skin where possible.
04 - Place onion quarters and lemon halves at the bottom of a roasting pan and set the turkey breast on top with skin side up.
05 - Pour broth into the roasting pan to keep the meat moist, if desired.
06 - Roast uncovered for 2 hours or until the internal temperature reaches 160°F at the thickest point.
07 - Increase oven temperature to 425°F for the last 10 minutes to crisp the skin, if preferred.
08 - Remove turkey from oven, loosely tent with foil, and let rest for 15 minutes before slicing and serving.