This kielbasa and sauerkraut casserole recipe is a hearty and flavorful dish that can be made using a food processor. Simply chop the onions and potatoes in the food processor, then layer them with sliced kielbasa and sauerkraut in a casserole dish. Bake in the oven until the potatoes are tender and the kielbasa is crispy. Serve with a dollop of sour cream for a delicious and comforting meal.