Makes 3 loaves
In a large bowl soften yeast in the lukewarm water.
Blend mashed sweet potatoes with melted butter until light and fluffy. Add with milk, salt, and sugar to yeast. Beat until light.
Stir in with a wooden spoon enough of the flour to make a soft dough.
Put in a greased bowl and cover with a towel. Set in a warm place until doubled in bulk.
Shape into 3 loaves and place in greased pans (9×5×3). Let rise to top of pans.
Bake 20 to 25 minutes in a preheated 350° oven until golden brown.