01 - Pat scallops thoroughly dry with paper towels, then season both sides generously with kosher salt and freshly ground black pepper.
02 - Heat olive oil and 1 tablespoon butter in a large skillet over medium-high heat until shimmering. Add scallops in a single layer without crowding. Sear for 2 to 3 minutes per side until golden brown crust forms and centers are just opaque. Transfer scallops to a plate and cover 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, stirring frequently, until fragrant and translucent.
04 - Stir in Cajun seasoning, smoked paprika, and cayenne pepper. Cook for 30 seconds, stirring constantly, until spices are fragrant and well incorporated.
05 - Pour in heavy cream and stock, using a wooden spoon to scrape up any browned bits from the bottom of the pan. 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 is completely melted and sauce is smooth. Taste and adjust seasoning with additional salt and pepper as needed.
07 - Return seared scallops to the pan, turning once to coat in sauce. Warm through for 1 minute. Remove from heat, sprinkle with chopped fresh parsley, and serve immediately with sauce spooned generously over scallops.