Mexican and Italian Yorkshire Pudding and Slop dessert I attempted a mashed yams dish for my first Thanksgiving which had an almond cruster brown sugar and butter topping. I added marshmellows for extra oomph! It turned out great and was a hit. Just mash yams like you would for mashed potatoes and add nutmeg, butter. Put in 9x13 glass dish and cover with butter (room temp)/brown sugar crumble. Bake @ 400 degrees F for 20-30 minutes.