Created by KitchenMagician on January 24, 2016
Step 1: In a large bowl, dissolve the yeast in the water. Warm the milk, sugar, the 1/2 cup butter and shortening and salt together in a small, heavy pan over low heat, just until the butter and shortening melt. Set the pan aside to cool to lukewarm.
Step 2: Add the liquid to the yeast, and let the mixture sit for 5 minutes. Mix in the eggs and potatoes. Stir in as much of the flour as is needed to form a soft dough. Cover the bowl with a towel, and let the dough rise until it has nearly doubled in size, about 1 1/2 to 2 hours.
Step 3: Sprinkle a counter with some of the remaining flour, and knead the dough for a couple of minutes to make it smooth and elastic. Add in a little flour, if needed, to make the dough more workable. Roll the dough out to a 1/2- to 1 1/2-inch thickness. Cut it into rounds with a 3-inch biscuit cutter. Brush half of each roll? top with melted butter and fold the unbuttered half over it, so that the upper half extends about 1/2 inch beyond the lower half. Arrange the rolls on a greased baking sheet with the rounded side of each roll just touching the flat side of the roll next to it. (photo shows buns baked in a large glass baking dish). Allow the rolls to sit, covered, for 1 hour or until they are doubled in size.
Step 4: Preheat oven to 400 degrees F. Bake rolls for 10 minutes. Reduce the temperature to 350 degrees F and bake rolls an additional 10 to 12 minutes, or until they are nicely browned. Serve the rolls hot.