Add the olive oil into a large pan over a medium heat
Add in the onion and garlic and sauté for 5 minutes
Stir in the tomato purée and chilli flakes
Add the chopped tomatoes, chicken stock and pasta

Simmer for 10 minutes or until the pasta is cooked
Stir in the cubed cooked chicken, dairy free cheese, oregano and seasoning
Cook for a couple of minutes and then serve