Mom's Chiffon Layer Cake

2 egg whites
1/3 c. sugar
2 c. SR flour
1 c. sugar
1 c. milk
1/2 c. oil
1 t. vanilla
2 egg yolks

Beat egg whites with 1/3 c. sugar until thick and glossy, but not stiff. Combine flour & sugar in mixing bowl. Add milk, oil, vanilla, & egg yolks. Beat at medium speed for 3 minutes. Scrape bowl and beaters frequently. Fold in egg whites. Pour into 2 sprayed 8" metal pans or 1 9x13 pan. Bake at 350 degrees for 25-30 minutes. Cool 10-20 minutes before removing from layer cake pans. Frost as desired.