A TWICE-baked potato is a type of potato dish that involves baking a potato TWICE. The potato is first baked in its skin, then cut in half and the insides are scooped out and mixed with other ingredients such as butter, cheese, and spices. The mixture is then put back into the potato skins and baked again. Idaho potatoes are a type of potato that is grown in the state of Idaho and are known for their high starch content and thick skin. They are often used for baking, frying, and mashing.