In a skillet, heat oil over medium heat. Add onions and cook until tender. Stir in ketchup, brown sugar, water, vinegar, worcestershire sauce, mustard, chili powder, and paprika. Bring to a boil. Add sauerkraut. Cover and reduce heat. Simmer 10 minutes. Add turkey. Simmer, uncovered, until turkey is heated through and sauce has thickened.