Start by boiling the pasta in salted water until al dente. I always cook it just shy of done because it finishes cooking in the sauce later. Drain and set it aside while you prepare the rest.
Slice the chicken into thin strips and coat them evenly with fajita seasoning. Heat olive oil in a large skillet and cook the chicken until it’s browned and fully cooked. Remove it from the skillet to keep it juicy.
In the same skillet, add the sliced peppers and onions. Cook them until they soften slightly but still hold some texture. The leftover seasoning in the pan adds extra flavor to the vegetables.
Lower the heat and add cream cheese and chicken broth to the skillet. Stir gently until the cream cheese melts into a smooth sauce. This step is key to getting that creamy consistency without lumps.
Add the cooked pasta and chicken back into the skillet. Sprinkle in the shredded Monterey Jack cheese and stir until everything is well coated and creamy. Taste and adjust salt if needed.