Start by preheating your oven to 350°F (175°C) to ensure it’s hot and ready for baking.
In a large skillet set over medium heat, add the ground beef and cook it until it’s browned and fully cooked through, breaking it apart with a spoon. Once cooked, drain any excess fat from the skillet.
Add the finely diced onion and minced garlic to the beef in the skillet. Sauté for about 3-4 minutes, or until the onion is soft and translucent. Stir occasionally to prevent burning.
Incorporate the taco seasoning into the skillet, followed by the rinsed black beans, drained corn, and the can of diced tomatoes with green chilies. Stir everything together and let it cook for an additional 5 minutes until all ingredients are well united and heated through.
Remove the skillet from the heat and carefully mix in the cooked rice, ensuring an even distribution throughout the mixture.
Lightly grease a 9x13 inch baking dish. Spread half of the beef mixture evenly across the bottom of the dish. Top this with 1 cup of the shredded sharp cheddar cheese.
Spoon the remaining beef mixture on top of the cheese layer, and then dollop the sour cream across the surface, spreading it lightly with a spatula for even coverage.
Finish by layering the remaining cheese on top, followed by an even sprinkle of the crushed tortilla chips to add a delightful crunch.
If you're seeking a touch of spice, scatter sliced jalapeños over the top of the casserole.
Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the cheese is melted, bubbling, and turning a lovely golden color.
Once done, remove the casserole from the oven and let it cool for a few minutes. Before serving, garnish the dish with freshly chopped cilantro for a bright flavor and appealing presentation.
Notes
Serve alongside a fresh green salad or additional sour cream and salsa for a complete Mexican-inspired meal!