In a large cast iron skillet over high heat, add diced peppers to a drizzle of olive oil and fry until lightly charred. Lower heat to medium and fry the onion until soft, then add in garlic and fry for a couple of minutes longer.
Add in beef and fry until fully browned, then stir in tomato paste and fry for a couple of minutes. Pour in stock and chopped tomatoes, then add oregano, smoked paprika, cumin, ground coriander, chilli powder, salt and pepper.
Stir in the uncooked rice, then keep on a gentle simmer until the rice is cooked through, gently stirring now and then (approx 20mins). If you need to add more liquid to cook the rice just gradually add more stock or water as needed.
Level out the mixture with your wooden spoon, then sprinkle over mozzarella and cheddar. Place the skillet under the grill and cook on high until the cheese melts.
Sprinkle over coriander/cilantro, then serve up and enjoy!
