By definition, an enchilada requires a corn tortilla, so it is not suitable for no-carb diets. Using fewer tortillas or specific low-carb tortillas can reduce the number of carbs in creamy chicken enchiladas.
The filling for creamy chicken enchiladas consists of cooked chicken in a cheese or other creamy sauce with some combination of chillies and other vegetables. All of these ingredients can be low-carb or even carb-free. Cooking the filling in casserole form rather than wrapping it in corn tortillas makes the meal very carb-friendly, and several low-carb websites recommend this option over sourcing specific commercially made low-carb tortillas.