Add the shrimp to the skillet in an even layer. Season with salt and black pepper. Cook for 1 to 2 minutes per side until the shrimp turn pink and opaque.
Stir in the remaining 2 tablespoons of butter, fresh lemon juice, and chopped parsley. Toss the shrimp continuously until the butter is fully melted and creates a glossy sauce.
Remove the skillet from the heat immediately to prevent overcooking the shrimp. Serve hot over your choice of pasta, rice, or with warm crusty bread.