If you want to increase the batch size, use a larger cooker—don’t fill the cooker more than halfway with butter, as it sometimes plops and bubbles as it cooks.
Cut the butter into chunks and put them in a 3½-quart (3.3-L) or larger slow cooker. Put the lid on slightly askew or propped above the rim of the insert with chop-sticks and cook on high for 4 to 5 hours; there will be a layer of crunchy-looki