Heat oven to 190C/170C fan/gas 5. Prick each potato a few times with a fork. Place in the oven and cook for 1 hr. Remove from the oven and, using a tea towel to protect your hands, cut them in half lengthwise. Use a spoon and scoop out the flesh, leaving behind enough skin and flesh to form a shell.
Heat the grill. Place the potato halves, cut side up, onto a baking tray. Brush with a little melted butter then grill for 3-5 mins until starting to crisp. Meanwhile mash the potato flesh with 100g of goat’s cheese, any leftover butter and cream, then season well. Spoon a little mash back into each potato shell, then top with a slice of goat’s cheese. Place under the grill and cook for 5 mins until golden.