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Chop onion and leek and soften in a pan with a splash of oil and some chunks of chorizo. Add garlic, a bay leaf, dried oregano, chilli flakes and smoked paprika at this stage. When the onion and leek have softened, scoop them out and set aside momentarily.
Use the same pan to fry off the chicken breasts (cut up into chunks). When the chicken is browned, put the onions and leek back in the pan.
Pour over a carton of passata or a can of chopped tomatoes, crumble in a chicken stock cube, add a good grind of black pepper and a little sugar. Simmer slowly for around half an hour. Adjust seasoning as required.
Meanwhile, grate cheese, chop up some more chorizo and weigh out 300g pasta shapes. Cook the pasta till al dente. Drain.
Put drained pasta in an ovenproof dish, pour over sauce and stir through pasta. Sprinkle the chorizo over pasta, and then top generously with cheese.
Bake in a preheated oven 180C (fan) for about 20 mins until bubbling at the edges.
HTH xxx