Prep Scallops: Remove the small, tough rectangular side muscle ("foot") from the scallops. Place scallops on paper towels and dry thoroughly.
Setup BGE: Set up your Big Green Egg for direct cooking and preheat to 500°F. Place a cast iron pan inside to preheat along with the grill.
Season: Season one side of the dry scallops with kosher salt.
Heat Oil: Once the pan is preheated, add enough high-smoke point oil to cover the bottom of the pan.
Sear Side 1: Carefully place the scallops in the pan salt side down. Season the top side with kosher salt. Cook undisturbed for 90 seconds.
Flip: Flip the scallops and cook for another 90 seconds.
Remove: Remove the scallops from the pan and set aside on a plate.
Make Sauce: Add butter, garlic, and shallots to the hot pan. Sauté for 1 minute until fragrant. Pour in the white wine to deglaze, scraping up the browned bits. Reduce wine by half. Whisk in heavy cream, lemon juice, and parsley. Simmer for 2-3 minutes until thickened.
Serve: Add the scallops back into the sauce just to warm through. Serve immediately over red quinoa.