Start by rinsing the shrimp thoroughly under cold water to remove any residue. After rinsing, gently pat them dry with paper towels to eliminate excess moisture, ensuring a better sear when cooked.
In a large skillet, place the unsalted butter over medium heat. Allow the butter to melt, letting it bubble gently – you want it to foam but be careful not to let it brown or burn.
Once the butter is melted and bubbly, add the minced garlic to the skillet. Sauté the garlic for about 1 minute, or until it becomes fragrant but remains pale in color; avoid browning it to keep the flavor mild.
Introduce the red pepper flakes to the skillet, stirring them into the butter-garlic mixture for about 30 seconds. This step will help release their heat and infuse the butter with a spicy kick.
Carefully add the shrimp to the skillet, arranging them in an even, single layer. Cook for 2-3 minutes on one side until the shrimp turn pink and shift to a slightly opaque appearance.
Flip the shrimp using tongs or a spatula. Season them generously with salt and freshly ground black pepper. Cook for an additional 1-2 minutes until the shrimp are completely cooked through and opaque all the way.
Upon finishing cooking, squeeze fresh lemon juice over the perfectly cooked shrimp. Sprinkle the chopped parsley generously on top, then toss everything together in the pan to ensure the shrimp are well-coated with the garlic butter sauce.
Serve the sizzling shrimp immediately on a platter, garnished with lemon wedges for guests to squeeze additional juice over their portions, enhancing the flavor even further.