Orange Chiffon Cake

2 egg whites
1/3 c. sugar
2 c. SR flour
1 c. sugar
1/2 c. oil
2 t. orange peel
1/2 c. orange juice
1/2 c. milk
2 egg yolks

Beat egg whites with 1/3 c. sugar until thick and glossy. Combine flour & sugar. Add peel, juice, milk, oil, & egg yolks. Mix at medium speed for 3 minutes. Fold egg whites into batter. Pour into sprayed 9x13 pan or 2 sprayed round cake pans. Bake at 350 for 25-30 minutes. Cool 10 minutes (20 minutes for round pans, before removing). Dust cooled cake with powdered sugar before serving, if desired.