Pat the shrimp very dry and place them in a bowl. Season with the kosher salt, black pepper, garlic powder, and dried oregano. Toss well so the shrimp are evenly coated.
1 1/2 pounds large shrimp, 1 teaspoon kosher salt, 3/4 teaspoon black pepper, 1/2 teaspoon garlic powder, 1/4 teaspoon dried oregano
Heat 1 tablespoon of the olive oil in a large skillet over medium-high heat. Once hot, add half of the shrimp in a single layer. Cook for 1 to 2 minutes per side, just until lightly golden and almost cooked through. Transfer to a plate. Note: you might need to cook the shrimp in three batches instead of two.
2 tablespoons olive oil, 1 1/2 pounds large shrimp
Add the remaining 1 tablespoon olive oil and repeat with the rest of the shrimp. Set aside. The shrimp will finish cooking in the sauce later.
2 tablespoons olive oil, 1 1/2 pounds large shrimp
Lower the heat to medium. Add the butter to the same skillet, then add the shallot. Cook for 2 to 3 minutes, stirring often, until softened. Add the garlic and crushed red pepper flakes and cook for 30 seconds, just until fragrant.
2 tablespoons unsalted butter, 1 large shallot, 5 garlic cloves, 1/4 teaspoon crushed red pepper flakes
Stir in the tomato paste and cook for 1 minute, stirring, until it deepens slightly in color. Add the sun-dried tomatoes and cook for another 30 seconds.
2 tablespoons tomato paste, 1/2 cup oil-packed sun-dried tomatoes
Pour in the white wine and scrape up anything flavorful from the bottom of the skillet. Let it simmer for 2 to 3 minutes, until slightly reduced. Add the chicken broth, heavy cream, and black pepper, then bring the sauce to a gentle simmer.
3/4 cup dry white wine, 1/2 cup chicken broth, 3/4 cup heavy cream, 1/4 teaspoon black pepper
Stir in the Parmigiano Reggiano until melted and smooth. Add the spinach a handful at a time and let it wilt into the sauce.
1/2 cup finely grated Parmigiano Reggiano, 5 ounces baby spinach
Return the shrimp and any juices from the plate to the skillet. Simmer gently for 1 to 2 minutes, just until the shrimp are cooked through and the sauce is silky and lightly thickened.
1 1/2 pounds large shrimp
Stir in the lemon zest, basil, and parsley. Taste and add more salt and black pepper as needed.
1 teaspoon lemon zest, 2 tablespoons chopped fresh basil, 1 tablespoon chopped fresh parsley
Spoon into shallow bowls and finish with extra Parmigiano Reggiano, a little more basil or parsley, and a few extra grinds of black pepper. Serve with toasted crusty bread for scooping, or over hot pasta for a more substantial dinner.
Store leftovers in an airtight container in the refrigerator for up to 2 days. Reheat gently over low heat.