1 onion, finely chopped
300g/10½oz dried pasta shapes, such as penne or fusilli
2 tbsp sunflower oil, plus extra for greasing
75g/2½oz mature cheddar, coarsely grated
150ml/5fl oz double cream
4 rashers smoked streaky bacon, thickly sliced
350g–500g/12oz–1lb 2oz leftover turkey, cut into small chunks
500g/1lb 2oz pasta sauce (homemade or from a jar)