In a small bowl mix together the seasoning ingredients. Set aside.
Cook pasta as per package instructions in a large pot of salted water. Drain once cooked.
Pat the chicken fillets dry and season with lemon pepper, onion powder, garlic powder and salt. Dredge the chicken in the flour and shake off excess.
Heat olive oil in a large skillet over medium high heat. When it is hot, add the chicken and sear on each side for about 5 minutes, until golden. Set aside and let it rest for 10 minutes, then slice.
Add garlic and butter to the same skillet, cook for 2 minutes over medium heat. Add the flour and stir to combine, about 2 minutes.
Gradually add the chicken broth, stirring continuously. Add the half and half and bring to a gentle simmer, then reduce the heat to low. Simmer for 5 minutes or until thickened.
Stir in Pecorino Romano cheese and add the lemon juice, cook until the cheese is melted. Season with the prepared spice mix.
Add the cooked pasta and chicken and stir to combine.
Garnish with fresh parsley.
Serve with lemon slices.
Enjoy!