Pat the shrimp dry with paper towels and set aside.
Heat the cast iron skillet over medium heat for 2 minutes.
Add the butter to the skillet and allow it to melt completely.
Add the minced garlic to the melted butter and sauté for 1 minute until fragrant, stirring constantly to avoid burning.
Add the shrimp to the skillet in a single layer and sprinkle with smoked paprika, crushed red pepper flakes, salt, and black pepper.
Cook the shrimp for 2 to 3 minutes on one side until pink and slightly opaque.
Flip the shrimp and cook for an additional 2 to 3 minutes until fully cooked and opaque.
Remove the skillet from heat and drizzle the fresh lemon juice over the shrimp.
Sprinkle the chopped fresh parsley on top and gently toss to combine all flavors.
Serve immediately directly from the cast iron skillet or transfer to a serving dish.