Pour 2 tablespoons olive oil into a cold skillet; sprinkle in garlic. Cook garlic over medium heat until sizzling and fragrant, 2 to 3 minutes. Stir onion, salt, and pepper into the garlic and olive oil; cook until onion is translucent, 5 to 10 minutes. Cook and stir ground beef into onion mixture until beef is browned and crumbly, 5 to 10 minutes.
Mix 2 cans Mexican-style corn, salsa, hot tomato sauce, 1 can chopped green chiles, and taco seasoning into ground beef mixture; bring to a boil. Reduce heat, cover skillet, and simmer until liquid has reduced, about 15 minutes.
Transfer meat mixture to a 10x14-inch casserole dish.
Stir corn bread mix, milk, vegetable oil, and egg together in a bowl; fold in 2 cans drained Mexican-style corn, 1 can drained green chiles, Mexican cheese blend, and 1 tablespoon olive oil. Spoon cornbread mixture over meat mixture.
Bake in the preheated oven until a toothpick inserted into the corn bread comes out clean, about 30 minutes.
