Wash shrimp and scallops under cold water. Pat them dry using a paper towel. Keep seafood ready in a clean bowl for cooking.

Place a large skillet on medium heat. Add butter and olive oil. Let it melt slowly until it becomes hot and slightly foamy.

Add chopped onion and garlic to the pan. Stir gently for two to three minutes. Cook until soft and fragrant but not burned.

Place shrimp and scallops into the skillet. Cook for about four to five minutes. Stir until shrimp turns pink and seafood becomes tender.

Sprinkle Cajun seasoning, paprika, salt, pepper, and chili flakes. Mix well so the spices coat the seafood evenly for strong flavor.

Add chicken broth slowly into the pan. Stir gently to combine with spices and seafood juices. Let it simmer for a few minutes.

Pour in heavy cream slowly while stirring. This creates a smooth and rich sauce. Keep heat low to avoid curdling the cream.

Stir in Parmesan cheese until melted. Add lemon juice for fresh flavor. Mix everything until sauce becomes thick and creamy.

Let the seafood cook in sauce for another two to three minutes. This helps all flavors blend together perfectly.

Turn off the heat. Sprinkle chopped parsley on top. Serve hot with rice, pasta, or bread for best taste