Heat the oil and fry the bacon, onion and garlic until cooked.
Spoon the mixture into the flan case.
Mix together the eggs, milk, cheese, mustard and seasonings and pour into the flan case.
Bake in a pre-heated oven 190° C, 170°C fan, Gas 5 for 25-30 minutes until the filling is set and pastry golden. Serve hot or cold.
Freezing and defrosting guidelines
Once the dish has cooled completely, transfer it to an airtight, freezer-safe container, seal and freeze for up to 1-3 months. To serve, defrost thoroughly in the fridge overnight before reheating. Loosely cover with foil and bake until dish is thoroughly heated through. Reheat until piping hot.
For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.