Directions

• Heat oven to 400F. Coat a 15 1/2 x 10 1/2 x 1-inch cookie sheet with cooking spray. Line bottom with waxed paper or parchment paper; spray paper.
• Beat egg whites and cream of tartar in mixer bowl with whisk attachment on high speed until foamy. Beating constantly, add 1/3 cup of the granulated sugar, 2 Tbs at a time. Beat after each addition to make certain sugar is dissolved before adding next. Continue beating until egg whites are glossy and stand in soft peaks.
• Beat egg yolks in clean mixer bowl on high speed until thick and lemon-colored, 35 minutes. Gradually beat in remaining 1/3 cup granulated sugar until mixture is pale yellow and sugar is dissolved. Beat in vanilla and salt.
• Sift flour over egg whites. Add yolk mixture. Fold gently but thoroughly until color is uniform and no streaks of flour remain. Do not stir. Pour into prepared pan; spread evenly.
• Bake in 400F oven until center springs back when lightly tapped with finger, 1012 minutes.
• Sprinkle clean kitchen towel with powdered sugar. Loosen cake from sides of pan with knife. Invert cake onto towel; carefully peel off waxed paper. Trim all cake edges with serrated knife. Roll up cake, starting from short end and rolling towel in with cake. Cool wrapped cake roll, seam-side down on wire rack.