This vegan chile rellenos recipe fits the bill and your diet. Try this recipe from feastingathome.com to fulfill your Mexican food craving without expanding your waistline. Bonus points: The Avocado Creama sauce is vegan and oil-free. The recipe can be easily adjusted for non-vegans by adding cheese and/or the meat of your choice.
https://www.feastingathome.com/vegan-stuffed-poblanos-with-avocado-cilantro-sauce/