In a large mixing bowl, sprinkle yeast over water; stir to dissolve. Add sugar, salt, eggs and milk. Blend with mixer. Add 4 cups flour; beat smooth. Add shortening and beat in remaining 4 cups flour. Cover with plastic wrap and chill overnight. Roll out of floured board to ⅛ inch thick. Cut into 2-½ inch squares. Deep fry at 360 degrees for 2-3 minutes until lightly browned on both sides. Drain on towel and sprinkle with powdered sugar. Serve hot!