Taco Tater Casserole

1 lb ground beef

1 small onion , diced finely

1 clove garlic , minced

1 (4 oz) can Old El Paso diced green chiles

1 (1 oz) package Old El Paso taco seasoning mix

1 (15 oz) can black beans, rinsed and drained

1 (12 oz) package frozen corn

3 cups shredded Mexican blend cheese

1 (28 oz) package frozen tater tots

1 (10 oz) can Old El Paso red enchilada sauce

Toppings: olives , cilantro, sour cream, tomatoes