Sift cake flour, salt and baking powder into a large bowl. Set bowl aside.
In a separate bowl, add butter, egg whites and granulated sugar.
Mix with a mixer until creamy.
Add in vanilla, mix.
Add in milk, mix.
Add the wet ingredients to the dry ingredients and mix. Do not overmix.
Grease and line (with parchment papetwo round 9-inch cake pans.
Pour cake batter into the cake pans.
Bake in a preheated 350-degree oven until golden brown, about 25-30 minutes, or until a toothpick inserted in the middle of the cake comes out clean.
Remove from the oven. After a few minutes, gently remove cakes from pans and cool on cooling racks.
While the cake is cooling, add sweetened coconut flakes to a cookie sheet, place in a preheated 350-degree oven for 3 to 5 minutes. Watch carefully so the coconut flakes don’t burn. They should be just lightly toasted.