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Cook the pasta following pack instructions. Heat the oven to 180C/160C fan/gas 4.
Meanwhile, heat the oil in a large pan over a medium heat and fry the peppers for 8 mins, stirring until they start to soften. Add the courgette and garlic, stir for a few minutes more, then tip in the passata and stir in the smoked paprika, bouillon, chilli, if using, and olives. Simmer for 3-4 mins.
Drain the pasta, reserving the pasta water. Tip the pasta into the passata mixture along with the chicken, half a mug of the pasta water and the basil. Stir together well, then tip into baking dish.
Mix the ricotta in a bowl with 5 tbsp of the pasta water and spread across the top of the pasta. Sprinkle over the cheddar, then bake for 35 mins. Scatter with a few extra basil leaves, if you like, and serve.