Brown the beef in a skillet over medium heat for about 5-7 minutes, breaking it apart until no pink remains.

Add the chopped onion and minced garlic to the skillet and sauté for about 3-4 minutes until the onion is translucent.

Stir in the Manwich sauce, diced tomatoes, diced bell pepper, and corn. Mix well and simmer for about 5 minutes.

Preheat your oven to 350°F (175°C). Spread the beef mixture evenly in a lightly greased baking dish.

Crush tortilla chips and sprinkle over the beef mixture, then layer shredded cheese on top.

Bake for 25-30 minutes until the cheese is melted and bubbly.

Let the casserole cool for about 5 minutes and garnish with sliced green onions before serving.