Peel
potatoes, cut in eighths. Cook in boiling water until
soft, about 20 minutes. Mash potatoes, set aside.
In
a large mixing bowl, cream butter and sugar until light
and fluffy. Add eggs one at a time, beating well after
each addition. Add mashed potatoes and mix well.
In
a small mixing bowl, combine flour, baking powder, cinnamon,
nutmeg and chocolate or cocoa. Stir well.
Alternately
add half of the flour mixture and half of the milk to
the potato mixture, blend after each addition. Repeat
with the remaining flour mixture and milk. Blend in
pecans.
Pour
batter into a greased and floured Bundt or tube pan.
Bake in preheated 350 degree F. oven for 40 to 45 minutes,
or until a toothpick inserted in the center comes out
clean. When cool, sprinkle with confectioners' sugar.