Hopefully someone will have the recipe you're looking for, but I thought this recipe might be good exchanging mashed sweet potato for the mashed potato.

I hope it's a help!

Betsy

* Exported from MasterCook II *

Raised Potato Doughnuts

Recipe By :
Serving Size : 1 Preparation Time :0:00
Categories : Doughnuts

Amount Measure Ingredient -- Preparation Method
-------- ------------ --------------------------------
1 Pkg Dry Yeast
1/2 Cup Mashed Potatoes
1/4 Cup Warm Water
1 Egg
1/2 Cup Milk
3/4 Tsp Salt
2 Tbls Butter
3 1/4 Cups Flour
1/4 Cup Sugar

Combine the dry yeast with the warm (110 degrees) water. Set aside. Heat the
milk with the butter and sugar in a small saucepan until the butter begins
to melt. Cool to lukewarm. Combine the mashed potatoes with the egg in a
large bowl. Stir in the cooled milk mixture, the dissolved yeast and the
salt. Gradually beat in enough of the flour to form a soft dough. Turn out
onto a lightly floured board. Knead until smooth. Place in a lightly
buttered bowl, turning to grease the entire outside surface. Cover. Let rise
in a warm place until doubled in bulk (1-1 1/2 hours). Punch down. Knead
again. Roll out on a lightly floured board to a thickness of 1/4". Cut out
using a floured doughnut cutter. Cover. Let rise until doubled. Preheat the
oil in the deep fryer. Fry doughnuts until browned on both side (about 2
minutes). Drain. Sprinkle with sugar. Yields 18 Doughnuts From:
Joel.Ehrlich@salata.com (Joel Ehrlich)