Preheat your oven to 400°F (200°C).

Rinse the shrimp under cold water and pat them dry with paper towels.

In a mixing bowl, combine the melted butter (or olive oil), garlic, Parmesan cheese, black pepper, and optional red pepper flakes.

Add the shrimp to the marinade, tossing gently to coat each piece thoroughly.

Arrange the coated shrimp in a single layer on the parchment-lined baking tray.

Place the baking tray in the preheated oven and bake the shrimp for 10-12 minutes.

Remove from the oven, let cool for a minute, serve warm garnished with parsley if desired.