Preheat the oven to 175°C (350°F).
In a roasting pan, combine potatoes, Kielbasa, onion, baby carrots, and garlic. Season with salt and pepper. Toss with olive oil.
Cover the baking dish with aluminum foil.
Bake in the preheated oven for 1 hour. Remove foil and continue baking until potatoes are fully cooked, about 30 minutes more.
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