Mashed Potato Bread recipe

I found this recipe online, but now can't find it to give it it's proper credit. Sorry!!!

1 medium potato
2 1/2 c boiling water
1/4 c. warm milk
2 pkg yeast
2 Tbs butter
2 Tbs sugar
5-6 c flour
2 tsp salt

Wash, scrub, and boil potato (leave skins on, you can get the vitamins from the skin too!) Once potato is cooked, reserve potato water, and remove skins from potato (now you can discard the skin). Mash up the potato and let it cool slightly. In large bowl, sprinkle yeast over warm milk, stir to dissolve. Mix cooled potato and butter and then add it to the bowl, along with 2 cups of the reserved potato water. Add remaining ingredients and mix well (will be a tad sticky). Knead 10 min (thank you, Lord, for my KitchenAid mixer!!)Transfer to an oiled bowl, turn to coat with oil. Cover with oiled plastic wrap. Let rise until doubled. Punch down, cut dough in half, shape into 2 balls and let it rest for 10 min. Press each ball down and shape into loaf pans. LLet rise until dough is above sides of pan. Slash tops. Bake at 375 for about 50 min (tap bottom to listen for hollow sound). If it's not quite done, you can finish cooking it on a flat stone.