Combine all of the ingredients (apart from the potatoes themselves) in a small dish. Place each potato on a sheet of foil, and drizzle generously with the garlic and herb butter. Use clean hands to rub the garlic mixture all over the potatoes.

Fold each piece of foil around the potatoes, creating a foil parcel for each. Place the wrapped potatoes in the slow cooker.

Cook on high for 3-4 hours. You can check whether they're cooked by poking a sharp knife straight through the foil.

When the slow cooker baked potatoes are ready, remove them from the foil, remembering to drizzle any remaining garlic butter over the top!