Easy mozzarella chicken recipe

INGREDIENTS
4 5-ounce (150 gram) boneless skinless chicken breasts
1 tablespoon Italian seasoning
1 teaspoon paprika
1/2 teaspoon onion powder
Salt and pepper, to season
1 tablespoon olive oil
1 onion, chopped
4 cloves garlic, minced
1 fire roasted pepper, (fire roasted capsicum), chopped
15- ounces 425 grams crushed tomatoes, OR tomato puree (Passata)
2 tablespoons tomato paste, garlic and herb flavoured if possible
Pinch crushed red pepper flakes OPTIONAL
3/4 cup shredded mozzarella
1 tablespoon freshly chopped parsley, to garnish