01 - Pat scallops completely dry with paper towels. Season both sides generously with kosher salt and freshly ground black pepper. Ensure scallops are at room temperature for even cooking.
02 - Heat olive oil and 1 tablespoon butter in a large skillet over medium-high heat until butter foams. 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 to a plate and tent loosely with foil.
03 - Reduce heat to medium. Add remaining 1 tablespoon butter to the same skillet. Sauté minced garlic and diced shallot for 1 to 2 minutes until fragrant and softened, being careful not to brown the garlic.
04 - Stir in Cajun seasoning, smoked paprika, and cayenne pepper. Cook for 30 seconds, constantly stirring to release essential oils and prevent burning. The spices should become fragrant.
05 - Pour in heavy cream and stock, using a wooden spoon to scrape up browned bits from the pan bottom. Simmer for 2 to 3 minutes until sauce slightly thickens and coats the back of a spoon.
06 - Add grated Parmesan cheese and fresh lemon juice. Stir continuously until cheese melts completely and sauce becomes smooth and velvety. Season with additional salt and pepper to taste.
07 - Return seared scallops to the pan, turning to coat in sauce. Warm through for 1 minute. Remove from heat, sprinkle with chopped fresh parsley, and serve immediately with sauce generously spooned over each scallop.