01 - Season both sides of the scallops generously with kosher salt and freshly ground black pepper. Ensure scallops are thoroughly patted dry to achieve proper searing.
02 - Heat olive oil and 1 tablespoon butter in a large skillet over medium-high heat. When butter foams, arrange scallops in a single layer without crowding. Sear for 2 to 3 minutes per side until deeply golden brown and just opaque in the center. Transfer to a plate and tent loosely with foil.
03 - Reduce heat to medium. Add remaining 1 tablespoon butter to the skillet along with minced garlic and diced shallot. Sauté for 1 to 2 minutes until fragrant and translucent, being careful not to brown the garlic.
04 - Stir in Cajun seasoning, smoked paprika, and cayenne pepper. Cook for 30 seconds, stirring constantly, until spices are fragrant and well-distributed.
05 - Pour in heavy cream and stock, using a wooden spoon to scrape up any browned bits from the pan bottom. Bring to a gentle simmer and cook for 2 to 3 minutes until sauce begins to thicken slightly.
06 - Add grated Parmesan cheese and fresh lemon juice, stirring until cheese melts completely and sauce is smooth. Taste and adjust seasoning with additional salt and pepper as needed.
07 - Return seared scallops to the pan and cook for 1 minute just to warm through. Remove from heat immediately, sprinkle with chopped fresh parsley, and serve promptly with sauce spooned generously over each scallop.