Heat oven to 220°C/200°C fan-assisted/Gas Mark 7. Prick the potatoes with a fork, place on a plate and microwave on high (900W) for 6 and a half minutes. Turn the potatoes over and microwave for a further three and a half. Transfer the potatoes to a baking sheet and brush with the oil. Season and place on the top shelf of the oven for 20 minutes until the skin is crisp and the flesh is soft. Reduce the temperature to 200°C/180°C fan-assisted/Gas Mark 6 if the potato browns too quickly.
Heat the remaining oil in a large non-stick frying pan over a medium heat and fry the onion for 5 minutes until soft. Add the garlic and Brussels sprouts, season and cook for a further 5 minutes until soft and golden.
Remove the potatoes from the oven. Make a cross in each potato and split open slightly.
Spoon over the Brussels sprout mixture and scatter with the stilton to serve.
4 medium Rooster potatoes (approx 350g)
1 ½ tbsp olive oil
1 large red onion, sliced
2 garlic cloves, finely chopped
400g leftover Brussels sprouts, shredded
40g Blue cheese, crumbled