Preheat the oven to 190ºC.
Heat the olive oil in an ovenproof skillet or casserole pan over medium heat. Add the minced beef and chorizo. Cook until the mince is golden brown and the chorizo has rendered its fat.
Add the diced onion, minced garlic, and Italian seasoning to the pan. Cook until the onions and garlic are soft and fragrant.
Pour in the stock and passata, then bring the mixture to a gentle simmer. Taste and adjust the seasoning with salt and pepper.
Add the broken lasagna sheets to the sauce. Cook uncovered for about 15-20 minutes, stirring occasionally to prevent sticking.
While the pasta is cooking, mix the mascarpone with the egg, grated parmesan, and mozzarella to create the white sauce.
Once the noodles are cooked, dollop the mascarpone mixture onto the pasta. Top with the shredded mozzarella.
Transfer the pan to the preheated oven and bake for 15 minutes, or until the cheese is golden and bubbling.
Sprinkle the finished dish with fresh basil leaves before serving.