Chiffon cakes are made with whipped eggs and oil. Oil makes the chiffon cake moist, and whipped eggs make it light. This recipe can be baked as a layer cake or in a tube pan.
Preheat the oven to 325 °F. For a traditional chiffon cake, use an ungreased 10" tube pan. If you want to make a layer cake line two 8” cake pans with parchment paper or butter and flour the bottom of the pans only.
Combine 3 ½ oz vegetable oil, 6 egg yolks, 6 oz water and 1 tablespoon vanilla extract in a mixer bowl. Mix on medium speed until well combined.
Sift 10 oz cake flour with 1 cup of the sugar, 1 tablespoon baking powder and ½ teaspoon table salt. With the mixer on low, add the dry ingredients to yolk mixture. Whip on high speed for 1 minute, then set aside
Whip 6 egg whites on medium speed to soft peak. Gradually add the remaining ½ cup sugar, increase the speed to medium high and whip to full peak. Fold the whites into the yolk mixture in three increments.
If making a layer cake, divide the batter between the two pans. If you're using a tube pan, pour all the batter into the pan. Bake until the middle of the cake springs back with lightly pressed, 30-35 minutes for the layers or about 50-60 minutes for the tube pan.
Cool the cake completely in the pan.
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Notes
If measuring the flour by volume use the “dip & sweep” method. That is, dip the measuring cup into the flour bin, overfill it, then sweep away the excess.