Peel and cut potatoes into 1 inch cubes. In a pot with cold water add potatoes. Set pot to medium high heat until it boils; and then reduce to a simmer. Parboil potatoes until about halfway done.
Remove potatoes and drain them (do not rinse). Place potatoes in a bowl and add olive oil, rosemary, garlic, salt and pepper (to taste).
Combine ingredients well, and then place them on a sheet pan that has been lined with foil.
Bake potatoes for 15 – 20 minutes at 400ᵒF or until golden brown. Once potatoes are done remove from oven and serve.