Pat the scallops completely dry with paper towels. This step is crucial for achieving that perfect golden crust. Remove the small side muscle if still attached.
Season both sides of the scallops generously with salt and pepper.
Heat a large stainless steel or cast-iron skillet over medium-high heat until very hot (about 2 minutes).
Add olive oil to the pan and wait until it starts to shimmer.
Carefully place the scallops in the pan, making sure they don't touch each other. Sear for 2-3 minutes without moving them.
Once the bottom is golden brown, flip each scallop and cook for another 1-2 minutes.
Remove scallops to a plate and lower heat to medium.
Add butter and minced garlic to the pan, cooking until fragrant (about 30 seconds).
Stir in lemon juice and zest, then return scallops to the pan and baste with the sauce.
Garnish with fresh parsley and serve immediately.