Add kielbasa to Dutch oven; cook 2 to 3 minutes, stirring frequently, until lightly browned. Remove kielbasa. Add onion; cook 5 to 8 minutes, stirring frequently, until onion starts to brown. Add potatoes, sauerkraut, kielbasa, broth, remaining 1/4 teaspoon salt and 1/4 teaspoon pepper to Dutch oven; stir. Place chicken on top of potato and sauerkraut mixture. Heat to boiling. Reduce heat to low; cover and simmer 25 to 30 minutes or until juice of chicken is clear when thickest part is cut to bone (at least 165°F) and potatoes are tender. Serve with sour cream.