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Preheat oven to 400°F.
Put the potatoes, olive oil, and mustard into a Ziploc plastic baggie. Mix well. Let sit as long as possible — ½ hour to overnight (in fridge).
Empty bag of potatoes into a large enough baking dish, so that potatoes cover bottom in a single layer. Sprinkle with salt and pepper. Stir.
Bake, uncovered for about 45 minutes to 1 hour. Stir gently after the first 35 minutes and then stir occasionally. Once nicely browned and tender, remove from oven and serve.