Preheat the oven to 450-degrees.
Heat the olive oil over medium heat in the cast iron skillet. Add the onion and peppers and cook until tender.
1 tablespoon olive oil, 1 medium onion, 1 medium green pepper, 1 large jalapeno pepper
Add the tomatoes and garlic and cook for 1-2 more minutes, taking care not to burn the garlic.
1 large clove garlic, 3 roma tomatoes
Push the vegetable mixture to the outside of the pan and add the ground beef to the center.
1 lb lean ground hamburg
Brown the beef and season with cumin, coriander, pepper and salt. Ground beef should always be cooked to an internal temperature of 160-degrees F according to FoodSafety.gov.
1 tablespoon cumin, 1 tablespoon coriander, 1 teaspoon chili powder, 1 teaspoon freshly ground black pepper, 1 teaspoon kosher salt
Add the cheese cubes to the top of the pan, and sprinkle with the remaining cumin and coriander.
8 oz manchego cheese, 8 oz monterey jack cheese
Slide the skillet into the oven and cook until the cheeses are melted. Remove from the oven and stir gently.
Serve hot.