Preheat oven to 350 degrees. Grease and flour a 9 by 13 inch cake pan or 1/4 sheet pan.
Sift together the flour, sugar, baking powder and salt.
Beat the butter to creamy first, then SLOWLY add milk, then cherries and juice.
Add them to dry ingredients. Beat mixture for 2 minutes.
Beat the egg whites separately. Gently fold into the batter.
Pour into prepared pans. Bake for 30 minutes or until cooked through. (check at the 25 minute mark)