Chicken pasta bake

Name: Chicken pasta bake
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Cuisine: European, Italian, Mediterranean
Ingredients: 4 tbsp olive oil; 1 onion, finely chopped; 2 garlic cloves, crushed; ¼ tsp chilli flakes; 2 x 400g cans chopped tomatoes; 1 tsp caster sugar; 6 tbsp mascarpone; 4 skinless chicken breasts, sliced into strips; 300g penne; 70g mature cheddar, grated; 50g grated mozzarella; ½ small bunch of parsley, finely chopped