- 1 lb. ground beef (I used 90/10)n1 (14.5 oz.) canned petite diced tomatoes (drained)n½ of a white onionn1 Tbsp chili powdern1 tsp cuminn1 tsp paprikan½ tsp garlic powdern½ tsp onion powdern½ tsp saltn½ tsp black peppernRefried beans (store-bought or homemade)nTostada shellsnShredded lettuce, for servingnChopped tomatoes, for servingnShredded cheddar cheese, for servingnChopped onion, for serving