Preheat the oven to 160°C.
Fry chopped onions in oil for 3 minutes in a large ovenproof pan.
Add beef mince and cook until brown, breaking it up as it fries.
Stir in chilli, pepper, garlic, and spices, then cook for 5 minutes until dry.
Add tomato purée, chutney, canned tomatoes, salt, and pepper.
Cover and bake in the oven for 1 hour.
Stir in half the coriander and increase oven heat to 200°C.
Layer a third of the mince, one tortilla, and a third of the cheeses in a dish.
Repeat the layers twice more to create three stacks.
Bake for 25 minutes until golden and bubbling.
Rest for 5 minutes and garnish with remaining coriander before serving.