Heat oven to 350℉/177℃.
Spray three 6-inch pans with baking spray. Set aside.
Whip egg whites to stiff peaks. Set aside.
Whisk together flour, baking powder, salt, and vanilla powder. Set aside.
With an electric mixer, beat shortening and sugar until light and fluffy, about 3-4 minutes.
Add flour mixture alternately with milk, beginning and ending with flour mixture.
Fold in egg whites.
Spoon into prepared pans.
Bake for 20-25 minutes, or until done.
Allow to cool at least 10 minutes in pans before turning out.
Turn out on wire rack and allow to cool completely.