COOK pasta following package directions. Drain and set aside, reserving 1 cup cooking liquid.
HEAT a large oven-safe frying pan over medium-high. Add bacon and cook, stirring, for 3 min. Add green pepper, mushrooms, garlic, Italian seasoning, salt and pepper and cook, stirring, for 3 min. Add beef and cook, breaking up with wooden spoon, for 4 min, then stir in ¾ cup of the pepperoni. Cook mixture for 2 min.
STIR in passata and sugar and reduce heat to medium-low. Simmer for 5 min. Add pasta and reserved cooking liquid and stir until combined. Sprinkle cheese and remaining ¼ cup pepperoni overtop.
BROIL in centre of oven until cheese is melted and browned, about 3 min. Sprinkle with parsley.