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. Arrange scallops in a single layer without crowding. Sear for 2–3 minutes per side until a deep golden crust forms and centers turn opaque. Transfer 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 1–2 minutes, stirring constantly, until fragrant and softened but not browned.
04 - Add Cajun seasoning, smoked paprika, and cayenne pepper to the pan. Stir continuously for 30 seconds to bloom the spices and release their essential oils.
05 - Pour in heavy cream and stock, using a wooden spoon to scrape up any browned bits from the pan bottom. Increase heat slightly and simmer for 2–3 minutes until the sauce begins to coat the back of a spoon.
06 - Whisk in Parmesan cheese until completely melted, then add fresh lemon juice. Taste and adjust seasoning with additional salt and pepper as needed.
07 - Return scallops to the skillet and spoon sauce over the top. Warm through for 1 minute. Remove from heat, garnish with chopped fresh parsley, and serve immediately with extra sauce.