Stuffed peppers

Name: Stuffed peppers
Prep time: 10 min
Cook time: 45 min
Total time: 55 min
Cuisine: Italian
Ingredients: drizzle of oil; 1 large onion , chopped; 2 garlic cloves; 500g beef mince; 2 x 400g cans chopped tomatoes; a few oregano sprigs, leaves picked, or 1 tbsp dried; 1 beef stock cube; 2 tbsp tomato ketchup; 4 peppers (mixed colours are nice); 100g grated mozzarella or cheddar; small bunch basil , leaves picked