In a small bowl, mix all the fajita seasonings together.
Heat a large nonstick skillet over medium with 1 tablespoon of olive oil. Season the chicken breast pieces with half of the fajita seasoning and place into a hot skillet. Cook until chicken is browned. Once the chicken is cooked, take it out of the pan and set aside.
In the same skillet, heat another tablespoon of olive oil. Add the onions and peppers. Cook for about 5 minutes until they are tender, stirring occasionally. Set alongside the cooked chicken.
To the same pan, add the dry pasta, garlic, can of Rotel, chicken broth, and the rest of the fajita seasoning. Stir well. Bring to a boil then reduce heat to low. Cover and simmer for about 12 minutes or until the pasta is cooked.
Once pasta is cooked, add in heavy cream, shredded cheese, cooked chicken, peppers, and onions. Turn up the heat to medium until the sauce has thickened. Add more salt if needed and enjoy!