In a bowl, combine 1 cup flour, sugar,yeast and salt; set aside. In another bowl, combine water, milk and butter; stir in potato flakes. Let stand for 1 minute. Add to dry ingredients. Add one egg; beat until smooth. Add enough remaining flour to form a soft dough. Turn onto a floured surface and knead until smooth and elastic, about 4-6 minutes. Cover and let stand for 10 minutes. Divide dough into 12 pieces; shape each into a ball. Place in a greased 13-in. x 9-in. baking pan. Place a large shallow pan on the counter; fill half full with boiling water. Place baking pan containing rolls over the water-filled pan. Cover and let rise for 15 minutes. Lightly beat remaining egg; brush over rolls. Bake at 375° for 20-25 minutes or until golden brown. Remove from pan to a wire rack.