Heat the butter in a large skillet over medium-high heat. Add the garlic and red pepper flakes, and cook for one minute until the garlic is fragrant and sizzling.
Add the shrimp, chicken broth, and kosher salt to the skillet. Cook until the shrimp turn pink and opaque, approximately 5 minutes, stirring occasionally.
Remove the skillet from the heat. Stir in the freshly squeezed lemon juice and ground black pepper.
Transfer the shrimp to a serving platter. Pour the pan juices over the shrimp. Sprinkle with parsley and serve immediately.