Any reason not to combine russets and Yukon Golds in same pot of mashed potatoes?

Hi, Gillian--At America's Test Kitchen we recommend using Russett potatoes for mashed potatoes. Their high starch content (and low moisture content) cause them to break down as they cook, creating fluffy mashed potatoes.

Enjoy!
Kristin

Not at all. Some people actually recommend a 50/50 combination of the two: http://www.bonappetit.com/test-kitchen/common-mistakes/article/9-mashed-potato-mistakes