In a small bowl, combine the maple syrup, brown sugar, Dijon, whole grain mustard, apple cider vinegar, garlic powder, onion powder and red pepper flakes. (Everything but the sausages.)
Add the Lil Smokies to the bottom of the slow cooker.
Pour the sauce over the Lil Smokies and stir to coat. Cover and cook on LOW 2 to 3 hours or HIGH about 1 to 1 1/2 hours.
Stir occasionally while cooking. Once the sauce is hot, glossy and slightly thickened, switch to WARM for serving.
Notes
For a sweeter version, add another tablespoon or two of brown sugar.
If the sauce is too thin, stir in a slurry of 2 tablespoons cornstarch mixed with 2 tablespoons water.
Storage: airtight in the refrigerator for 2 to 3 days.
Keyword christmas party appetizers, crockpot appetizers, crockpot lil smokies, game day food, lil smokies recipes, lil smokies recipes crockpot, little smokies crockpot, maple dijon sauce, slow cooker appetizers