Scatter the halved baby potatoes evenly across the bottom of your slow cooker insert to form the base layer.
Evenly distribute the sliced onion and minced garlic (if using) over the potatoes.
Top with the sausage slices, followed by the sauerkraut.
Sprinkle in the caraway seeds, black pepper, and a small amount of salt. If desired, dust the top with brown sugar to mellow the kraut’s acidity.
Carefully pour the chicken broth across the surface to moisten all layers.
Secure the lid and set the cooker to LOW for 6 to 7 hours, or HIGH for approximately 3 to 4 hours, until the potatoes are fork-tender and the kielbasa is fully warmed through.
Once done, gently fold the ingredients together for even distribution before plating. Serve immediately, optionally garnished with chopped fresh parsley. Complements well with grainy mustard or a warm slice of crusty bread.