Preheat oven to 425 F. Toss thinly sliced potato with 2 Tbsp olive oil in a plastic bag. Combine paprika, rosemary, garlic powder, salt & pepper; add to potato slices & toss again. Roast in a single layer on a baking sheet about 10-15 minutes. In a skillet, add sauerkraut with juice & diced onion. Simmer for a few minutes until onion is tender. Drain well; set aside to cool slightly.