Preheat oven to 350 ℉
Heat the oil in a skillet over medium-high heat. Add the beef, breaking it up as it cooks. Add the Mexican spice and salt. Continue cooking until browned, about 7-8 minutes.
Mix in the black beans and green chilis until just combined.
Assemble the casserole by starting with 1/3 of enchilada sauce on the bottom. Add 4 corn tortillas, spacing them out in the pan, they may slightly overlap. Evenly spread 1/3 of the meat & bean mixture. Then evenly spread 1 cup of cheese.
Repeat 2 more times, ending with cheese on top.
Bake for 15 minutes or until cheese is melted and enchilada sauce is bubbling. Garnish with cilantro and serve immediately. Enjoy!