Prepare the Scallops: Pat the scallops dry with paper towels and season them with salt and pepper on both sides. This helps to achieve a nice sear.
Heat the Butter: In a large stainless-steel skillet, melt 2 tablespoons of butter over medium-high heat until bubbling but not browned.
Sear the Scallops: Add the scallops to the pan, ensuring they are not crowded. Sear for about 2-3 minutes on one side until a golden crust forms. Flip and sear the other side for another 2-3 minutes, depending on their size. They should be opaque in the center. Remove the scallops from the pan and set aside.
Make the Sauce: In the same skillet, reduce the heat to medium and add the remaining 2 tablespoons of butter. Once melted, add the minced garlic and sauté for about 30 seconds until fragrant. Be careful not to burn the garlic.
Add Lemon: Stir in the lemon zest and lemon juice, scraping up any browned bits from the bottom of the pan for extra flavor. Let it simmer for about 1 minute to combine the flavors.
Combining: Return the scallops to the skillet, spooning the sauce over them to coat. Allow to heat together for about 1 minute.
Serve: Transfer the scallops to a serving platter, drizzle with the lemon garlic butter sauce, and garnish with fresh parsley and lemon slices.