Mix together the beans, enchilada sauce, olives, tame jalapenos and water.
Place 1/3 of the bean mixture on the bottom of pan.
Cover this with 1/3 of the tortillas ripped to cover the entire pan.
Sprinkle this layer with chopped onions and vegan cheese (optional).
Repeat layering until all the mixture and tortillas are gone. The last layer should be beans and then vegan cheese (optional) and onion.
Cover and let sit overnight.
Preheat the oven to 350° and bake 30 minutes.