Ask HN: Potato knish recipe?

I know a lot of people here are seriously into food and cooking, so I figured, why not ask?

Any ideas for a good potato knish recipe? Aiming for the round, baked knishes a la Yonah Schimmel's in New York (or what they used to sell at Mort's Deli in Minneapolis, or at Billy Sherman's Deli in St. Louis). Definitely NOT aiming for the square, fried knishes out of too many food carts or vending machines.

I've tried several recipes, but the dough part especially has never turned out right. If anyone knows the kind of knish I am talking about, and has succeeded in making something similar, I would much appreciate knowing how it's done!