Using the slow cooker to make hot chocolate is a fabulous idea, especially when entertaining a crowd and you want to keep your hot chocolate warm for a long time. Turn your slow cooker to HIGH and mix the cocoa powder, sweetener, and heavy cream to a paste as per the recipe card. Slowly add the almond milk while whisking until all the lumps of cocoa are removed. Keep the hot chocolate on WARM or LOW heat for up to 6 hours. Do not keep any leftover hot chocolate as the warm milk should be thrown away.