Rinse scallops under cool water and remove the side muscle if still intact. Pat scallops as dry as possible using two sheets of paper towel or a clean dish towel. Season all over with salt and pepper. Mince the parsley and garlic and set aside.

Add the oil to a 12-inch cast iron skillet and bring to high heat. Once the skillet is hot and starts to smoke, add the scallops to the pan and sear for 2 minutes per side, undisturbed, or until a golden brown crust forms. It helps to arrange the scallops around the perimeter of the pan if possible as it’s usually the hottest part of the pan.

Remove scallops from the skillet and set them aside on a plate. Remove the skillet from heat and let cool for 2 minutes. Give the pan a quick wipe if you prefer. Add the butter, garlic, lemon, and fresh parsley to the skillet, stirring occasionally until fully melted. Cook on low heat if needed. 

Return the scallops to the skillet on low heat and cook for an additional 30-90 seconds. Use a spoon to spoon the butter over the scallops. Place on a serving dish and drizzle with extra lemon butter sauce as desired. Sprinkle with a pinch of leftover fresh herbs and serve immediately.