In the bowl of your slow cooker, toss in the little smokies, whole berry cranberry sauce, and chili sauce. Give everything a quick stir to coat the sausages evenly in the sauce.
Cook the sausages on low for 6 hours or, if you're in a bit of a rush, crank it up to high for 4 hours. Either way, your kitchen is going to smell amazing while these cook.
Once they’re done, these cocktail sausages are ready to serve straight from the slow cooker. Just set out some toothpicks and let your guests dig in!