01 - Bring a large pot of salted water to a rolling boil. Add pasta and cook according to package directions until al dente. Reserve ½ cup of pasta water before draining. Set drained pasta aside.
02 - In a large skillet over medium heat, melt the butter. Add minced garlic and sauté for 1 minute until fragrant and lightly golden.
03 - Stir in Dijon mustard, smoked paprika, crushed red pepper flakes, Worcestershire sauce, lemon zest, and lemon juice. Cook for 1 to 2 minutes, stirring frequently to blend the flavors.
04 - Fold in chopped parsley, chives, kosher salt, and black pepper. Stir until evenly combined.
05 - Add the drained pasta to the skillet and toss to coat. Gradually add reserved pasta water, a splash at a time, tossing continuously until a glossy, creamy sauce forms and clings to the noodles.
06 - If using shredded chicken or grilled steak, fold it into the pasta now. Cook for an additional 2 minutes until heated through.
07 - Plate immediately and finish with extra fresh herbs, grated parmesan, and lemon wedges if desired.