Put all ingredients other than the mint in a baking dish. Mix well and spread the potatoes in a single layer.
In a preheated 375-degree oven, bake the potatoes until tender and golden on top, about 20 minutes, although the time may vary depending on your oven and the size of the potato dice.
Remove from the oven and add the chopped mint just before serving. Toss well.
Serve hot or at room temperature.