Sauté aromatics: Heat olive oil and butter in a large skillet over medium heat. Add garlic and onion; sauté 2–3 minutes until fragrant.
Make sauce: Stir in cream, broth, lemon juice, salt, pepper, and smoked paprika. Bring to a gentle simmer.
Cook seafood: Add seafood to the skillet. Cook 4–6 minutes, stirring occasionally, until seafood is just cooked through (shrimp pink, scallops opaque).
Finish: Stir in chopped parsley. Adjust seasoning with salt, pepper, or extra lemon juice.
Serve: Serve immediately over rice, pasta, or with crusty bread to soak up the creamy garlic sauce.