01 -
Cut the fully cooked kielbasa into 1/2-inch coins. Add the pieces to a 4-quart or larger slow cooker.
02 -
In a bowl, stir together the chopped apples, brown sugar, honey, apple cider, Dijon mustard, garlic powder, black pepper, and red pepper flakes.
03 -
Pour the apple mixture over the kielbasa. Stir until the sausage pieces are evenly coated with the glaze.
04 -
Cover and cook on low for 4 hours or on high for 2 hours, stirring once if possible, until the apples are tender and the sauce is glossy.
05 -
Stir gently, taste, and add a small pinch of salt only if needed. Sprinkle with parsley and serve warm with toothpicks.