Sift flour and baking powder in bowl; set aside.

In a another large bowl, beat egg white and cream of tartar until meringue-like but not stiff.

Gradually add sugar while beating. Add vanilla and vegetable oil.

Add egg yolks one at a time and continue beating.

Add cake flour and baking powder and continue mixing.

Grease muffin pans and pour mixture about 2/3 full.

Bake in 350°F preheated oven 12 to 15 minutes or until golden brown.

It's done if toothpick inserted in center comes out clean.