If frozen, thaw your turkey breast in the refrigerator. Allow about 24 hours for every 4-5 pounds.
Preheat your oven to 375°F (190°C).
In a bowl, mix the softened butter with minced garlic, chopped rosemary, thyme, sage, salt, pepper, and lemon zest (if using).
Remove the turkey from its packaging and pat it dry with paper towels.
Gently loosen the skin of the turkey breast with your fingers, being careful not to tear it.
Take about 2/3 of your garlic herb butter mixture and spread it evenly under the skin.
Rub the remaining butter all over the outside of the turkey breast.
If desired, tie the turkey breast with kitchen twine to ensure even cooking.
Place the turkey breast in a roasting pan, skin side up.
Roast in the preheated oven for about 20 minutes per pound, or until the internal temperature reaches 165°F (74°C).
Baste the turkey with its juices every 30 minutes to keep it moist and help the skin crisp up.
Once done, remove from the oven and let it rest for 15-20 minutes before carving.
Carve the turkey breast into thin slices against the grain and serve with your favorite sides.