Potato buns for Shake Shack burgers. Recipe from @yums80 1 teaspoon active dry yeast�2 tablespoons warm water - dissolve in a bowl - leave for 5 minutes. Add below ingredients to a bowl and mix. 1/2 cup scalded milk, cooled�1/4 cup prepared mashed potatoes�2 1/2 tablespoons (40g) soft butter �2 tablespoons white sugar�3/4 teaspoon salt�1/2 egg, beaten (keep the other 1/2 to egg wash) 1 cup flour Once mixed, add a further 1 and a 1/4 cups all-purpose flour and knead to get a smooth elastic dough.