Place potatoes and water in a microwave-safe dish. Cover and microwave on high for 4 minutes or until tender; drain.
In a large skillet, sautÃ© kielbasa and onion in oil until onion is tender. Add potatoes; sautÃ© 3-5 minutes longer or until kielbasa and potatoes are lightly browned.
Combine the brown sugar, vinegar, mustard, thyme and pepper; stir into skillet. Bring to a boil. Reduce heat; simmer, uncovered, for 2-3 minutes or until heated through. Add spinach and bacon; cook and stir until spinach is wilted.