Pat prawns dry. Season with salt, pepper, and paprika; toss to coat evenly.
Heat a large skillet over medium-high. Add olive oil and 1 tbsp butter.
Sear prawns in a single layer 1–2 minutes per side until just pink. Transfer to a plate.
Lower heat to medium. Melt remaining butter. Stir in garlic and red pepper flakes; cook 30 seconds.
Pour in white wine and lemon juice. Simmer 1 minute to reduce slightly, scraping browned bits.
Return prawns and juices to the pan. Toss to coat; sprinkle parsley and lemon zest. Taste and adjust seasoning.
Serve hot right away with crusty bread, rice, or pasta to catch the sauce.