Place a skillet over medium-high heat until thoroughly heated. Coat scallops with cooking spray, and then salt and pepper right before placing on skillet. Carefully place scallops in hot skillet. Sear 3-5 minutes or until browned, flip sides, and cook another 2-3 minutes. Remove scallops from pan, and keep them warm in an oven at 150-175ºF.
In same pan, add wine to deglaze the pan, or use a wooden spoon to scrape the brown bits from the pan. Add onion, and bring wine to a boil. Boil for 5 minutes or until liquid reduces to 2 tablespoons. Over low heat, whisk in butter cubes, 1 tablespoon at a time, until fully incorporated. Stir in parsley and green onion. Salt and pepper to taste. Serve scallops with sauce.
Recipe by Close Harbour Seafood at https://closeharbourseafoodct.com/project/seared-scallops-in-white-wine-butter-sauce/