Preheat the oven to 190°C fan. Then spray your tray with low-calorie cooking spray.
Wrap each chipolata in a strip of bacon to make your pigs in blankets. Place in the tray, with the ends of the bacon face-down.
Add the carrot and parsnip batons. Spray the top with low-calorie cooking spray and sprinkle over the sage and onion granules. Place in the oven and cook for 40 minutes, tossing around halfway through — being careful you don't displace the bacon from the sausages.
Whisk the boiling water into the cranberry sauce and stock pot to make a sauce.
After 40 minutes, add the onion, sprouts, and peas, and pour over the sauce. Season with salt and pepper, then return to the oven for a further 20-25 minutes — until the "pigs" are golden, and the vegetables are tender.