Cook pasta according to package directions for al dente; drain. Preheat broiler. , In a 10-inch cast-iron or other ovenproof skillet, heat butter over medium heat. Stir in flour until blended; cook and stir until lightly browned, 1-2 minutes (do not burn). Gradually whisk in cream, milk, Cajun seasoning, salt and pepper. Bring to a boil, stirring constantly. Reduce heat; cook and stir until thickened, about 5 minutes. Stir in cheese until melted. Add pasta, chicken, bacon and jalapeno; cook and stir until heated through. Sprinkle chips over top., Broil 3-4 inches from heat until chips are browned, about 30 seconds.