Tender Potato Biscuits

Details

Ingredients

• 2 ½ cups all-purpose flour
• 2 tablespoons baking powder
• 1 teaspoon salt
• ¼ cup sugar
• ¼ cup butter or margarine
• 1 ½ cups leftover mashed potatoes
• 1 egg, beaten
• ⅓ cup cold water
• ⅓ cup milk
• 2 tablespoons milk, or as needed