Preheat the oven to gas 6, 200ºC, 180ºC.
Place the mince and onion in a large saucepan and fry for 5 minutes over a medium heat. Add the Worcestershire sauce, stock cube, 125ml water and seasoning and fry for a further 5 minutes, covered. Transfer to an ovenproof serving dish.
Rub the butter into the flour until it resembles breadcrumbs. Stir in the oats and cheese, season to taste.
Sprinkle over the mince and bake for 20-25 minutes. Serve with fresh vegetables.
Cook’s tip: Try adding some peas or frozen mixed vegetables to the mix.
See more British classics
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.