Prepare the Sauce. In a mixing bowl, whisk together grape jelly, chili sauce, Worcestershire Sauce, Dijon Mustard, and spice until well combined.
Layer in the Crock Pot. Place the little smokies sausages in the Crock Pot. If you're adding optional ingredients like onions, bell peppers, or pineapple, you can layer them with the sausages.
Pour the Sauce. Pour the sauce mixture over the sausages and optional ingredients, ensuring they are well coated.
Cook on Low. Set your Crock Pot to the low setting and let it cook for about 2-3 hours, or until the sausages are heated through and the sauce is hot and well blended. You can stir the sausages occasionally to make sure they are evenly coated in the sauce.
Serve. Using toothpicks, skewer the little smokies and serve them in a serving dish. You can garnish with fresh chopped parsley, chives, or green onions for a touch of freshness.