Cook pasta according to package directions; set aside.
Pat chicken dry with paper towels, and coat with taco seasoning.
In a cast iron skillet, heat olive oil over medium heat. Add chicken and cook, turning once, until the chicken is completely cooked through, about 6 minutes per side.
Remove chicken from pan, and cover with foil.
Add butter to skillet, and melt over medium heat. Slowly add heavy cream, whisking to incorporate all the bits left behind from cooking the chicken. Whisk constantly, and cook about 2 minutes.
Add cheese and Rotel: stir until thickened and cheese is melted.
Stir in cooked pasta, and reduce heat to low.
Slice chicken into strips, and place on top of the pasta;sprinkle with reserved Rotel.