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Preheat the oven to 350 degrees F.
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Place the cut red potatoes in a large bowl of ice water to soak for at least 20 minutes. This will make for crisp potatoes.
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After 20 minutes, drain and then pat the potatoes dry with a dish towel.
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Combine the red potatoes, shallot, garlic, chopped rosemary, rosemary sprig, olive oil, salt, and pepper in a large mixing bowl. Mix to combine.
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Spread the potatoes, onions, and rosemary out on a baking sheet lined with a piece of parchment paper.
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Bake in the oven for 50 minutes. Take the potatoes out halfway through and give them a good mix to rearrange the potatoes.