In a skillet over medium heat, cook the ground beef and onion until the beef is browned and the onion is soft. Drain any grease.
Stir in the red enchilada sauce, green chiles, black beans, and corn. Season with salt and pepper.
Lightly coat the inside of a slow cooker with non-stick spray.
Spread a layer of tortilla strips on the bottom.
Top with a portion of the beef mixture, then sprinkle with cheese.
Repeat the layers until all ingredients are used, ending with cheese on top.
Cover and cook on low for 4–5 hours or on high for 2–3 hours, until heated through and the cheese is melted.
Notes
Tips, Tricks & Storage
Cook on lowMake sure to cook on the low setting to keep the tortillas from drying out. If you accidentally let it go too long, gently stir in a little extra enchilada sauce before serving to restore moisture.Layer evenlyCut tortilla strips evenly so they cook uniformly. This prevents the casserole from turning mushy or too thick in spots.Add a little crunch & extra flavor!Before serving, top your casserole with crushed tortilla chips or diced fresh onions for texture. You can also top this with taco sauce, avocado, guacamole, black olives, or sour cream!CheeseA mix of cheddar and Monterey Jack gives the perfect balance of melt and flavor, but really, you can use any cheese with this. Don’t skimp as each layer needs a bit of cheese to hold everything together.Make-aheadAssemble everything the night before, refrigerate, then start cooking in the morning. Great for busy days or dinner parties!StorageLet leftovers fully cool before transferring to airtight containers. Store in the fridge for up to 3 days or freeze portions for up to 3 months. Reheat in the microwave or oven with a splash of enchilada sauce, water, or broth to bring it back to life.