1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour one 13×9 inch pan.
2 Sift the flour, white sugar, baking powder and salt together. Mix in the shortening, milk and vanilla. Beat until well combined. Add the egg whites and beat for 2 minutes. Pour the batter into the prepared pan.
3 Bake at 350 degrees F (175 degrees C) for 20 to 25 minutes. Let cool then ice.
4 To Make Icing: Melt butter in a saucepan until it begins to brown. Remove from heat and add the confectioners’ sugar, evaporated milk or half and half, hot water and 1-1/2 teaspoons vanilla extract. Beat at medium speed for three minutes. Then pour icing over cake and allow icing to set. Enjoy!