Question: are idaho potatoes good for mashed potatoes?
Answer: Not all tubers are created equal as far as mashed potatoes are concerned. Potatoes fall into three categories: starchy, waxy, and all-purpose. You want to use the starchy ones to get a creamy mash. We prefer Yukon golds for their buttery texture (and golden color), but Russets (aka Idaho potatoes) are also good.