Pot luck at work today, so I am eating the leftovers. I made a mexican caserole as follows: In large roaster layer tortillas (oil the pan first), rice mixed with salsa, cheese, tortillas, can of refritos, taco seasoned ground beef, cheese, tortillas, green chili (I used my frozen stock but Stokes green chili with pork is OK), cheese (I like cheese) and a final layer of tortillas. Cover and cook at 350 for 45 minutes.
The key is in the layering. Don't make any one layer too thick. You can adjust spiciness to your audience by the salsa used, whether it gets put in the beans as well, and the brand of green chili. Stokes is the safest for gringos. They make it in chicken as well as pork.
I have a lot of Indian nationals at work, so I left out the ground beef for theirs, and substituted grilled chicken. I also used the vegetarian refritos and used the vegetarian green chili sauce. I actually prefer the taste of the vegetarian refritos as they are cleaner, if less traditional.