To serve, place 2-3 tablespoonfuls of the bean chilli in each taco shell. Top with the grated cheese, chopped coriander (if using), and a spoon of yoghurt and put on plates.
Once defrosted, increase the heat and cook until the mince is piping hot. Serve with the taco shells, lettuce, cheese, tomatoes, avocado, chilli and coriander. Any leftover mushrooms can be frozen.