Heat one tablespoon of butter in a large skillet over medium-high heat. Season the seafood with half the kosher salt and black pepper.
When the butter starts foaming, add the seafood to the skillet and cook, stirring often, until just cooked through and no longer translucent, about 3 minutes.
Using a slotted spoon, transfer the seafood to a plate, cover with foil, and set aside.
Pour the liquids out of the skillet, wipe it clean with paper towels (careful, it’s hot), and add the remaining butter. Reduce the heat to medium.
When the butter starts foaming, add the garlic to the skillet. Sauté, stirring, until fragrant, 30-60 seconds, depending on how hot your skillet is.
Reduce the heat to medium-low. Add the cream, the cayenne pepper, and the remaining kosher salt and black pepper. Bring to a gentle simmer, stirring. This should take about 1 minute.
Add the Parmesan cheese and gently stir until melted, about 30 seconds.
Add the seafood back to the skillet. Gently stir to combine with the sauce and to reheat, about 1 more minute. Sprinkle with parsley and serve.
Video
Notes
*While you can theoretically cook the seafood from frozen (though it will take longer and won't cook as evenly), I prefer to thaw it first, either overnight in the fridge, or by submerging it in a bowl of cool water for 5 minutes, replacing the water once, then drying the pieces on paper towels.**Please use freshly minced garlic cloves. The garlic is very important here and jarred minced garlic won't be the same.