Preheat the oven to 190°C (gas mark 5).
Heat a large ovenproof frying pan over medium-high heat. Add the minced beef and cook, breaking it up with a spoon, until no longer pink. Drain off any excess fat.
Add the chopped onion and cook for about 5 minutes, until softened.
Stir in the chopped peppers and cook for a further 3–5 minutes, until they begin to soften.
Stir in the chopped tomatoes (with their juices), passata, uncooked rice, beef stock, garlic powder, onion powder, dried mixed herbs, salt and black pepper until well combined.
Bring to a gentle simmer, then remove from the heat.
If your pan isn’t ovenproof, transfer the mixture to a 23cm x 33cm baking dish and cover with foil.
Bake for 30 minutes, or until the rice is tender and most of the liquid has been absorbed.
Remove the foil, sprinkle the grated cheddar over the top, then return to the oven and bake for a further 10–15 minutes, until the cheese is melted, bubbling and golden around the edges.
Leave to stand for 5–10 minutes before serving.