In a small bowl, combine the softened butter, minced garlic, rosemary, thyme, parsley, lemon zest, salt, and pepper. Mix until all the herbs are well incorporated into the butter.
Place the turkey tenderloin on a cutting board and pat it dry with paper towels. Season it lightly with salt and pepper on all sides.
Carefully spread half of the herb butter mixture over the top of the turkey tenderloin, ensuring it's evenly coated.
In a large oven-safe skillet, heat the olive oil over medium-high heat. Once hot, add the turkey tenderloin and sear it for about 3-4 minutes on each side, or until golden brown.
After searing, remove the skillet from the heat. Top the turkey with the remaining herb butter mixture and place lemon slices around it.
Transfer the skillet to the preheated oven and roast the turkey for 25-30 minutes, or until it reaches an internal temperature of 165°F (74°C).
Once cooked, remove the skillet from the oven and let the turkey rest for about 5-10 minutes before slicing.
Notes
Serve the sliced turkey tenderloin on a platter, garnished with the roasted lemon slices and a sprinkle of fresh herbs for a pop of color.