Preheat oven to 375°F (190°C).

1. Cook macaroni in salted water until al dente. Drain and set aside.
2. In a large skillet, heat olive oil over medium heat. Add diced onion and sauté until soft, about 3–4 minutes. Add garlic and cook 1 more minute.
3. Add ground beef and cook until browned. Drain excess fat.
4. Stir in taco seasoning, diced tomatoes with green chilies, tomato sauce, black beans, and corn. Simmer for 5–7 minutes.
5. Add cooked pasta and half of the shredded cheese to the skillet. Stir to combine.
6. Transfer the mixture to a greased 9×13-inch baking dish and spread evenly.
7. Top with remaining cheese.
8. Bake uncovered for 20–25 minutes until cheese is melted and bubbly.
9. Let rest for a few minutes before serving. Garnish with cilantro or green onions if desired.