For the filling
01 -
1 tablespoon olive oil
02 -
1 small onion, finely chopped
03 -
1 lb (450 g) ground sirloin or lean ground beef
04 -
2 tablespoons low-sodium taco seasoning
05 -
8 oz (225 g) processed American cheese (such as Velveeta), cubed
06 -
1 (10 oz) can diced tomatoes with green chiles (such as RO*TEL), undrained
For serving
07 -
8 crunchy taco shells
08 -
2 cups shredded iceberg lettuce
09 -
Toppings of choice: diced tomato, sour cream, hot sauce (optional)