In a mixing bowl, marinade shrimps with salt and black pepper. Allow them to rest for 15 minutes to absorb the flavors.
Preheat a large skillet (preferably cast iron) over medium to low heat. Add olive oil to the skillet.
Once the oil is hot, add the marinated shrimp to the skillet. Cook for 2 minutes, flipping halfway through to ensure even cooking.
Remove the shrimp from the skillet and set aside.
In the same skillet, add 2 tablespoons of butter. Once it melts, add the minced garlic and cook until fragrant, about 30 seconds.
Add the chili flakes and lemon juice, stirring to combine.
Return the cooked shrimp to the skillet along with the remaining butter. Cook for an additional 3-5 minutes, ensuring the shrimp are well coated in the sauce.
Finally, add the chopped parsley and mix well before removing from heat.
Serve your garlic butter shrimp over cooked rice, with lemon wedges on the side, and garnish with additional chopped parsley.