Preheat the oven to 350 degrees F.
Coat a 13x9 baking dish with cooking spray. Set aside.
In a large skillet over medium-high heat, heat the oil and add the onions.
Cook for 2-3 minutes or until onions are soft.
Add the garlic and cook for an additional minute.
Add the ground beef to the pan and break it apart with a spatula, cook until browned, drain if necessary. I like to swap out my spatula once most of the meat is browned to avoid contaminating the cooked beef with the spatula that was touching the raw meat.
Return the beef to the pan and add the seasonings, stir to combine.
Stir in the beans, salsa, and corn and then cook until heated through.
Pour the mixture into the prepared baking dish.
Sprinkle the top with the crushed corn chips and shredded cheese.
Bake for 12-15 minutes or until the cheese is melted and the casserole is heated through.
Serve immediately with your favorite toppings.
Store any leftovers in the refrigerator.