Warm oil in a large skillet over medium-high heat. Add garlic and red pepper flakes, and cook for 30-60 seconds, just until fragrant.
Add shrimp to the pan and cook for 1 minute, turning and flipping as needed so they cook evenly. Season lightly with salt and pepper.
Add butter cubes, lemon juice, and parsley. Cook for 2-3 minutes more, until the butter is melted and the shrimp is opaque and cooked through. Remove pan from the heat. Serve shrimp and sauce right away and enjoy!