The potatoes should look glossy with visible onion flakes clinging to the skins.
Cover the slow cooker with the lid and cook the potatoes on LOW for 4 to 5 hours, or on HIGH for about 2 to 3 hours, until the potatoes are very tender when pierced with a fork. During the last hour of cooking, lift the lid once or twice and gently stir so the butter and onion coating redistributes and the potatoes cook and brown evenly along the edges.
Once the potatoes are fork-tender and coated
