Mix the mustard, honey, garlic and black pepper in a small bowl. Add the sliced kielbasa and mustard mixture to a 1.5 quart or larger slow cooker.
Cover and cook on HIGH for 1.5 hours, stirring occasionally.
Switch the slow cooker to warm for the party.
Leave out toothpicks for your guest to enjoy the kielbasa bites.
Note: This recipe can be doubled or tripled for a larger party. You also can brown the kielbasa in a pan on the stove-top before adding to the slow cooker.