Ok, this is the easiest thing ever.
Use your slow cooker to cook sweet potatoes or yams. Have I mentioned how much I love my slow cooker(s)? They’re simply awesome. Everyone needs at least one.
Wash the sweet potatoes (or yams or any potatoes) and pile them into your slow cooker (I’m using my 6-quart here). That’s it. No poking or water needed. Cook on LOW for up to around 6 hours (depending on their size, mine are usually medium sized) or they might be done around 4 hours if you cook them on HIGH.
Enjoy as is, save for later, mash with grass fed butter, or any other fun idea.