Apple Skillet Cake

Junior 3rd Prize Winner by Dianne Illingwor
3 tablespoons butter
2/3 cup firmly packed brown sugar
3 cups (about 3 medium) pared, thinly sliced apples
1/3 cup raisins
1 1/3 cups sifted Pillsbury's BEST flour
2 teaspoons double-acting baking powder
1/2 teaspoon salt
1/4 cup sugar
2/3 cup firmly packed brown sugar
1/3 cup Crisco
2 unbeaten egg yolks
1 teaspoon French's Vanilla
2/3 cup undiluted Pet Milk
2 egg whites

Melt butter in heavy skillet measuring 10 inches across top. Remove from heat; add 2/3 cups brown sugar. Arrange apples in skillet; add raisins.
Sift flour, baking powder and salt. Set aside. Add sugar and 2/3 cup brown sugar gradually to shortening, creaming well. Blend in egg yolks and vanilla; beat well. Add dry ingredients alternately with milk; blend thoroughly after each addition.
Beat egg whites until stiff but not dry; fold into batter. Pour over apples. Bake in moderate oven (350 F) 35 to 40 minutes. Turn out of skillet immediately. Serve Warm.