Preheat oven to 350 degrees.

Flour a 9 inch tube pan (angel food cake pan).

Stir in the milk, oil and vanilla until smooth. Spread in an ungreased 9-inch square baking pan.

Sift 3 times or more:
3/4 cup potato flour or rice flour
1/2 cup sugar

Beat until light and creamy:
8 egg yolks

Stir these into flour mixture.

Beat until stiff but not dry:
9 egg whites

Fold the egg whites into the flour mixture by hand, gently but rapidly. Bake about 45 minutes (or until done). Cool upside down, as for angel food cake.