I don't generally care for lasagna that goes below the border, however, this one is pretty tasty. I have added some additions noted below in bold that I haven't tried yet, but I think would be yummy. Give it a try and let me know.
1 (15oz) can black beans, drained and rinsed
1 (14oz) can dice crushed tomatoes
1 (16oz) can refried beans
1/4 cup chopped cilantro
1 clove finely minced garlic
1 (4oz) can chopped green chilies
2 cup corn, canned or frozen
2 scallions, minced
1/2 tsp. cumin
1/2 tsp. oregano
8 corn tortillas
1 1/2 - 2 cups Monterey Jack cheese
1/2 - 1 cup cheddar cheese
sour cream, optional
options to mix it up - Enchilada Sauce and shredded chicken
In a large bowl, mix together beans, tomatoes, cilantro, garlic, chilies, corn, scallions, cumin and oregano.
Spray with non-stick cooking spray a square 2 quart baking dish. Place two tortillas down (or however many will fit to cover the bottom). Spread with a thin layer of refried beans. Spread 1/3 of the bean mixture over tortillas. Sprinkle with 1/3 of Monterey Jack cheese. Repeat layering twice more - it helps to put the refried beans on the tortillas before you put them on the casserole. For the last layer, put tortillas to top, sprinkle with cheddar cheese.
Option to mix things up - add in shredded chicken to bean mixture and cover prepared casserole in enchilada sauce - probably only 1/2 a 15 oz can.
Bake 30-40 minutes until hot through-out.