Read our how to use up your Christmas leftovers for more fantastic ideas!
4 medium fluffy potatoes (approx 350g), such as Maris Piper or King Edward
1 ½ tablespoons olive oil
1 large red onion, peeled and sliced
2 garlic cloves, peeled and finely chopped
400g leftover cooked Brussels sprouts, shredded
40g Blue cheese, crumbled