Place the turkey tenderloins in a glass baking dish.
Heat the salted butter in a small skillet over medium heat. Swirl it occasionally until the butter begins to brown. Add in the fresh herbs, garlic, salt, and black pepper. Cook for an additional minute and remove from heat. Add the lemon juice and stir.
Pour the butter and herb mixture over top of the turkey.
Cook for 20 minutes, flip turkey over, and cook for an additional 20 minutes. Remove from oven and spoon butter sauce over top of the turkey and flip over 1 more time. Cook for 10-20 minutes or until the internal temperature reaches 165 degrees.
Remove from oven and let rest 5 minutes before slicing.