Lightly butter 2 (8-inch) round springform cake pans or spray with non-stick cooking spray. Stir together cake flour, graham cracker crumbs and baking powder in medium bowl. In another bowl, combine nonfat milk, applesauce and vanilla. Add to dry ingredients, stirring just until blended. Beat egg whites until frothy. Add cream of tartar and continue beating until thick and foamy. Gradually add sugar, beating until soft, smooth peaks form. Fold half into batter until blended. Fold in remaining whites until just blended. Divide batter into prepared pans, spreading evenly. Bake at 350 degrees 15 to 20 minutes or until wooden pick inserted in center comes out clean. Sprinkle marshmallows and chocolate chips over tops of cakes. Place under broiler to brown slightly. Let cool to warm and serve. Makes 2 cakes, 16 servings. Each serving contains about: 136 calories, 169 mg sodium, 1 mg cholesterol and 2 grams fat. ----