In my collection of recipes, I have one called "Butter Balls" which is very similar to Dorie's Pecan Powder Puffs. I must say, however, that Dorie's recipe is better. Why?
Dorie's recipe has a higher proportion of butter, a pinch of cinnamon, and pecans instead of walnuts. Also, Dorie asks you to chill the dough for two hours and I'm sure that helps preserve the shape. But really, it's all about the butter.
Another winner! Check out Tianne of Buttercream Barbie for Dorie's recipe.