PREPARATION:
- Preheat oven to 375°F. Grease 15-1/2X10-1/2-inch jelly-roll pan; line pan with waxed paper. Grease waxed paper; set pan aside. Place flour, baking powder and salt in small bowl; stir to combine. Beat egg yolks and 2/3 cup granulated sugar in small bowl with electric mixer at high speed about 5 minutes or until thick and lemon-colored, scraping down side of bowl once. Beat in vanilla; set aside.
- Beat egg whites in clean large bowl using clean beaters with electric mixer at high speed until foamy. Gradually beat in remaining 1/3 cup granulated sugar, 1 tablespoon at a time, until stiff peaks form.
- Fold flour mixture into egg yolk mixture; fold into egg white mixture until evenly incorporated. Spread mixture into prepared pan. Bake 12 to 15 minutes or until cake springs back when lightly touched with finger.
- Lightly sift powdered sugar over clean dish towel. Loosen warm cake from edges of pan; invert onto prepared towel. Remove pan; carefully peel off waxed paper. Gently roll up cake in towel from short end, jelly-roll style. Let rolled cake cool completely on wire rack.
- For chocolate filling, place chocolate chips and cream in heavy 1-quart saucepan. Heat over low heat until chocolate is melted, stirring frequently. Pour into small bowl; stir in rum. Cover and refrigerate about 1-1/2 hours or until filling is of spreading consistency, stirring occasionally.
- Prepare Cocoa Frosting and White Chocolate Curls; refrigerate until ready to use.
- Unroll cake; remove towel. Spread cake with chilled chocolate filling to within 1/2 inch of edge; reroll cake. Spread Cocoa Frosting over cake roll. Garnish with White Chocolate Curls. Sprinkle with cocoa.