01 - Bring a large pot of salted water to a rolling boil. Add the pasta and cook according to package directions until al dente. Reserve 1/2 cup of the starchy pasta water before draining. Set the drained pasta aside.
02 - In a large skillet over medium heat, melt the butter. Add the minced garlic and sauté for about 1 minute, stirring constantly, until fragrant and lightly golden.
03 - Stir in the Dijon mustard, smoked paprika, crushed red pepper flakes, Worcestershire sauce, lemon zest, and lemon juice. Cook for 1 to 2 minutes, stirring frequently to bloom the spices and meld the flavors.
04 - Fold in the chopped parsley, chives, kosher salt, and black pepper. Stir until the herbs are evenly distributed throughout the sauce.
05 - Transfer the cooked pasta into the skillet with the sauce. Toss gently, adding the reserved pasta water a splash at a time, until the sauce coats the noodles in a glossy, creamy layer.
06 - If using shredded chicken or grilled steak, fold it into the pasta now. Cook for an additional 2 minutes until the protein is heated through.
07 - Serve immediately in warm bowls, garnished with extra fresh herbs, grated Parmesan cheese, and lemon wedges alongside.