Line your slow cooker with a heavy-duty aluminum foil for easy cleanup.
In a large bowl, combine the ground beef, diced onion, drained green chiles, taco seasoning, crushed tortilla chips, shredded Monterey Jack cheese, eggs, and milk. Mix thoroughly.
2 pounds lean ground beef, ½ small onion, 4 ounces can chopped green chiles, 1 ounce taco seasoning envelope, 1 cup crushed nacho cheese chips, 1 cup shredded Monterey Jack cheese, 2 eggs, ½ cup milk
Transfer the mixture to the lined slow cooker and press it evenly into the shape of the cooker.
Spread the taco sauce over the top and cover with the lid.
½ cup taco sauce
Cook on high for 3 hours or on low for 6 hours.
Just before serving, top with shredded Colby Jack cheese and let it melt.
1 cup shredded Colby Jack cheese
Garnish with your favorite taco toppings, such as shredded lettuce, diced tomatoes, sliced avocado, sour cream, or salsa.
Scallions
Serve hot and enjoy!