One of our new faves is one my SO made up. It’s basically a mexican-type stew-kinda thing.
Basically, you slice up a bunch of onions and peppers* and start sauteeing some in a skillet. Once they’ve released all the moisture and cooked back to fairly dry, add some drained canned tomatoes (diced or cut-up whole) and some more onions & peppers. Cook that down until it’s thick again, then add your meat and some more onions & peppers. Cook that until the last set of onions & peppers have gone very soft. Anytime you need a little liquid, use some of the juice from the tomatoes - but you really want this thick & gloopy, so add liquid sparingly and cook it down good.
Somewhere back there you should also have added a bunch of garlic, plus whatever herbs appeal (we’ve been using cilantro and oregano and a little chili powder).
*Peppers = some mix of bells, jalepenos, serranos, anaheim/green chiles, poblanos, habaneros, etc. Depends on what you have/can get, what pepper flavor you want to have, and how hot you like it.
Fry or bake corn tortillas (or buy the ones sold for tostados). You want flat, crispy corn tortillas. You could probably also use tortilla chips, but it won’t be as pretty.
Towards the end, heat up a can of black beans or refries, and heat up a can of Mexican or Southwest corn. Shred some lettuce, grate some cheese, chop some onions, slice some avocado, maybe some olives - whatever sounds good as garnish/toppers. Make or open some salsa.
When everything is ready, build up the layers. A tortilla, some beans, some stew, some corn, maybe some cheese or sour cream, then repeat. Do two or three layers. When you get to the top, add your toppings.
Yes, this does take a while, but it’s worth it. You can speed up the process by just doing one set of onions/peppers, but it’s not as good.
We’ve made this with pork, beef, and chicken (leftover and canned), and it’s always terrific. It’s a good way to stretch a little bit of leftover meat into a full meal.