01 - Pat the scallops completely dry with paper towels and season both sides generously with salt and pepper.
02 - Heat 1 tablespoon olive oil and 1 tablespoon butter in a large skillet over medium-high heat until shimmering and slightly smoking.
03 - Add scallops in a single layer without overcrowding the pan. Sear undisturbed for 2 minutes until a deep golden-brown crust forms on the bottom.
04 - Flip each scallop carefully and sear the second side for 1 to 2 minutes, until just opaque throughout. Transfer scallops to a clean plate and tent loosely with aluminum foil to keep warm.
05 - Reduce heat to medium. Add the remaining olive oil and butter to the skillet. Add minced garlic and sauté for 30 seconds until fragrant, being careful not to burn.
06 - Stir in lemon zest, lemon juice, and red pepper flakes if using. Simmer for 1 minute, scraping up any browned bits from the bottom of the pan to incorporate into the sauce.
07 - Return scallops to the pan and spoon the lemon-garlic butter sauce over them. Cook for 1 minute just to warm through. Sprinkle with chopped parsley and serve immediately.