Preheat oven to 450°.
Scrub potatoes and dice into 1 inch pieces. Place pieces in large bowl.
In a small bowl, mix together crushed garlic and olive oil. Pour over potatoes and toss.
Spread potatoes in a single layer on a large pan with sides. Strip needles off rosemary sprigs and sprinkle over potatoes.
Bake for 20 minutes. Use a spatula to toss potatoes. Bake an additional 20 minutes or just until potatoes are nicely browned.
Serve hot.