Sear the Scallops: Pat the scallops dry and season lightly with salt and black pepper. Melt 1 tbsp butter in a skillet over medium-high heat and sear the scallops for 1 to 2 minutes per side, until golden. Remove and set aside.
Cook the Shrimp: In the same skillet, add the shrimp and cook for 1 to 2 minutes per side, until pink and tender. Remove and set aside with the scallops.
Build the Flavor: Melt the remaining butter in the skillet. Add the shallot and garlic, then cook for 1 to 2 minutes, until fragrant and softened.
Make the Creamy Sauce: Pour in the seafood stock or chicken broth and stir in the fish stock powder. Simmer for 2 minutes, then add the heavy cream, Parmesan cheese, paprika, salt, and black pepper.
Add the Seafood: Return the shrimp and scallops to the creamy sauce. Spoon the sauce over the seafood and let everything warm together for 2 to 3 minutes.
Garnish and Serve: Sprinkle with fresh parsley and serve warm. Pairs beautifully with rice, pasta, or crusty bread.