Bring a large pot of salted water to a boil and cook the pasta according to package instructions until al dente.
Reserve about 1/2 cup of pasta water before draining the pasta.
Heat olive oil in a large skillet over medium-high heat.
Add the chicken pieces to the skillet and season with paprika, garlic powder, salt, and black pepper.
Cook the chicken until golden brown and fully cooked through.
Remove the chicken from the pan and set it aside.
In the same skillet, melt the butter over medium heat.
Add the minced garlic and sauté until fragrant.
Stir in Dijon mustard, lemon juice, smoked paprika, and red pepper flakes.
Pour in the heavy cream and stir until the sauce becomes smooth.
Add grated Parmesan cheese and continue stirring until the sauce thickens slightly.
Return the cooked chicken to the skillet and toss it in the sauce.
Add the cooked pasta to the skillet and gently toss everything together.
If the sauce is too thick, add a splash of reserved pasta water.
Sprinkle fresh parsley on top and serve warm.