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Remember all ingredients all -- must be weighed out on a scale to make this recipe.
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Combine the room temperature butter with the sugar and beat a good five minutes or more until fluffy.
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Add in the salt and vanilla, beat again until well combined.
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Add in the one cup room temperature egg whites, beating in and scraping well the bottom and sides of bowl.
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Add in the combination of baking powder and both weighed out flours in three parts, alternating with the room temperature milk.
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Ending with the flour and blend only until combined. Do not over beat.
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Pour into 2 greased and floured 8 or 9 inch cake pans, or a 9 x 13 prepared pan.
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Bake in preheated 325 degree oven about 30 - 35 minutes, or until a tester comes away clean just with a crumb or two clinging.
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Place on wire racks still in pan and cool 15 minutes.
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Remove after 15 minutes out of the pans onto to the cooling rack, and cool completely.
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When cooled frost, or wrap and store.