Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper and set aside.
In a large bowl combine 1 ½ pounds large raw shrimp (peeled and deveined), 4 tablespoons melted unsalted butter, 4 cloves minced garlic, 1 tablespoon chopped fresh parsley, and salt and pepper to taste. Toss until the shrimp are evenly coated.
In a small bowl mix ½ cup Italian bread crumbs with 4 tablespoons grated parmesan cheese.
Sprinkle the bread crumb–parmesan mixture evenly over the coated shrimp and toss gently so the crumbs adhere. If needed, press the crumbs onto the shrimp with your hands or a spatula.
Arrange the shrimp in a single layer on the prepared baking sheet.
Bake for about 7 minutes, then switch the oven to broil and broil 1–2 minutes more, watching closely, until the topping is golden and the shrimp are opaque and cooked through.
Remove from the oven, garnish with chopped fresh parsley, and serve immediately.